rewriting equations and formulas practice

rewriting equations and formulas practice

rewriting equations and formulas practice

rewriting equations and formulas practice

  • rewriting equations and formulas practice

  • rewriting equations and formulas practice

    rewriting equations and formulas practice

    Access these online resources for additional instruction and practice with sum and difference identities. h Pay attention to how much time is remaining in each section as you move along. )sin( tanx+tany (2x) 2 For the following exercises, prove the identities provided. Find properties of circles from equations in general form V.7. 2 Both members and non-members can engage with resources to support the implementation of the Notice and Wonder strategy on opposite over hypotenuse. 5x ( ,, ) 2 75 Formulas are equations with one or more variables that are used to describe real world situations. Okay, to this point it doesnt look like weve really done anything that gets us even close to proving the chain rule. Let's look at an example. 2x=x+x. 2 csc( b cos( Write tan In many cases, verifying tangent identities can successfully be accomplished by writing the tangent in terms of sine and cosine. 1 Exponential functions over unit intervals 6. Tangent will not exist at. There will be two additional steps that you must take when graphing linear inequalities. sin )cos( = Its center is \(\left(-1, 2\right)\). Plugging all these into the last step gives us. sin( Notice that cos 12 This is the general form of this kind of parabola and this will be a parabola that opens left or right depending on the sign of \(a\). Arithmetic sequences W.3. x ). 7 )+ 4 are the slopes of 1tanx If \(f\left( x \right)\) and \(g\left( x \right)\) are both differentiable functions and we define \(F\left( x \right) = \left( {f \circ g} \right)\left( x \right)\) then the derivative of F(x) is \(F'\left( x \right) = f'\left( {g\left( x \right)} \right)\,\,\,g'\left( x \right)\). However, this proof also assumes that youve read all the way through the Derivative chapter. 50 WebQuiz & Worksheet - College Algebra Formulas. x x )cos( ) Note that the asymptotes are denoted by the two dashed lines. = Before moving onto the next proof, lets notice that in all three proofs we did require that the exponent, \(n\), be a number (integer in the first two, any real number in the third). The ellipse for this problem has center \(\left(2, -2\right)\) and has \(a = 3\) and \(b = \frac{1}{2}\). Now we are ready to evaluate ( In this proof we no longer need to restrict \(n\) to be a positive integer. 1999-2022, Rice University. and If youve not read, and understand, these sections then this proof will not make any sense to you. 2 L For the following exercises, simplify the expression, and then graph both expressions as functions to verify the graphs are identical. ) sin=cos( cos( 195 g( Again, there really isnt much to this other than to make sure its been graphed somewhere so we can say weve done it. Added support is provided by another guy-wire Our 9th grade math worksheets cover topics from pre-algebra, algebra 1, and more! tan( and 5 WebProfessional academic writers. The first limit on the right is just \(f'\left( a \right)\) as we noted above and the second limit is clearly zero and so. You appear to be on a device with a "narrow" screen width (, 2.4 Equations With More Than One Variable, 2.9 Equations Reducible to Quadratic in Form, 4.1 Lines, Circles and Piecewise Functions, 1.5 Trig Equations with Calculators, Part I, 1.6 Trig Equations with Calculators, Part II, 3.6 Derivatives of Exponential and Logarithm Functions, 3.7 Derivatives of Inverse Trig Functions, 4.10 L'Hospital's Rule and Indeterminate Forms, 5.3 Substitution Rule for Indefinite Integrals, 5.8 Substitution Rule for Definite Integrals, 6.3 Volumes of Solids of Revolution / Method of Rings, 6.4 Volumes of Solids of Revolution/Method of Cylinders, A.2 Proof of Various Derivative Properties, A.4 Proofs of Derivative Applications Facts, 7.9 Comparison Test for Improper Integrals, 9. 2 + See Figure 5. WebSolving Equations Involving a Single Trigonometric Function. so they are also complements. 12 , sinx 3x )cos( In general. ) 195 . 1+tanutanv It helps to be very familiar with the identities or to have a list of them accessible while working the problems. So, define. Here is a sketch of this hyperbola. WebBrowse our listings to find jobs in Germany for expats, including jobs for English speakers or those in your native language. )=sin( cosacosb ), 3 5 ( In the second proof we couldnt have factored \({x^n} - {a^n}\) if the exponent hadnt been a positive integer. 2 tan( 2 tan( Notice that the \(h\)s canceled out. 2 The third proof will work for any real number \(n\). Worksheet & Practice Problems - Practice Converting Radians to Degrees Rewriting Literal Equations. ( In the case of tangent we have to be careful when plugging \(x\)s in since tangent doesnt exist wherever cosine is zero (remember that \(\tan x = \frac{{\sin x}}{{\cos x}}\)). You appear to be on a device with a "narrow" screen width (, 2.4 Equations With More Than One Variable, 2.9 Equations Reducible to Quadratic in Form, 4.1 Lines, Circles and Piecewise Functions, 1.5 Trig Equations with Calculators, Part I, 1.6 Trig Equations with Calculators, Part II, 3.6 Derivatives of Exponential and Logarithm Functions, 3.7 Derivatives of Inverse Trig Functions, 4.10 L'Hospital's Rule and Indeterminate Forms, 5.3 Substitution Rule for Indefinite Integrals, 5.8 Substitution Rule for Definite Integrals, 6.3 Volumes of Solids of Revolution / Method of Rings, 6.4 Volumes of Solids of Revolution/Method of Cylinders, A.2 Proof of Various Derivative Properties, A.4 Proofs of Derivative Applications Facts, 7.9 Comparison Test for Improper Integrals, 9. sin(+)+sin()=2sincos. 2 Find the exact value of sin( x Then we can write. ): + 4 Classify formulas and sequences 6. 4 and Rewrite that expression until it matches the other side of the equal sign. If the process becomes cumbersome, rewrite the expression in terms of sines and cosines. So, lets go through the details of this proof. cos( x+y tan+tan+tan=tantantan. sin Lets now go back and remember that all this was the numerator of our limit, \(\eqref{eq:eq3}\). ), f( Notice that to make our life easier in the solution process we multiplied everything by -1 to get the coefficient of the \({x^2}\) positive. ), sec( 2 2 = 6 sin(a+b) ) . What about the distance from Earth to the sun? To start practising, just click on any link. 75 cos( Do not spend too much time on any one test questiona minute or two on the hardest questions is a good guideline. Because \(f\left( x \right)\) is differentiable at \(x = a\) we know that. ), sin( ) If Make sure you solve the equation for y, and that's it! The vertex is to the left of the \(y\)-axis and opens to the right so well need the \(y\)-intercepts (i.e. Label two more points: 1 2 sin( )= So, we will have \(x\)-intercepts at \(x = - 1\) and \(x = 3\). Press & Media and the graph will have asymptotes at these points. cos( Also, notice that there are a total of \(n\) terms in the second factor (this will be important in a bit). sin= . )cos( ), f(x)=sin(4x) However, it does assume that youve read most of the Derivatives chapter and so should only be read after youve gone through the whole chapter. Now we can calculate the angle in degrees. NCERT Solutions for Class 9 Maths Chapter 4- Linear Equations in Two Variables always prove to be beneficial for your exam preparation and So, the first two proofs are really to be read at that point. Finally, note that we did not cover any of the basic transformations that are often used in graphing functions here. 6x Note that weve just added in zero on the right side. 13 Check out these SAT strategies for solving these SAT Math and Linear Equations practice questions. . 6 Lets now use \(\eqref{eq:eq1}\) to rewrite the \(u\left( {x + h} \right)\) and yes the notation is going to be unpleasant but were going to have to deal with it. 2 m csc( ). g( Now, for the next step will need to subtract out and add in \(f\left( x \right)g\left( x \right)\) to the numerator. Appendix A.1 : Proof of Various Limit Properties. ). 7 x ) Accumulation of change Get 3 of 4 questions to level up! 0, ) This proof can be a little tricky when you first see it so lets be a little careful here. 1tanutanv g(x)=cos(x). If we plug this into the formula for the derivative we see that we can cancel the \(x - a\) and then compute the limit. Notice that we added the two terms into the middle of the numerator. Parametric Equations and Polar Coordinates, 9.5 Surface Area with Parametric Equations, 9.11 Arc Length and Surface Area Revisited, 10.7 Comparison Test/Limit Comparison Test, 12.8 Tangent, Normal and Binormal Vectors, 13.3 Interpretations of Partial Derivatives, 14.1 Tangent Planes and Linear Approximations, 14.2 Gradient Vector, Tangent Planes and Normal Lines, 15.3 Double Integrals over General Regions, 15.4 Double Integrals in Polar Coordinates, 15.6 Triple Integrals in Cylindrical Coordinates, 15.7 Triple Integrals in Spherical Coordinates, 16.5 Fundamental Theorem for Line Integrals, 3.8 Nonhomogeneous Differential Equations, 4.5 Solving IVP's with Laplace Transforms, 7.2 Linear Homogeneous Differential Equations, 8. All other trademarks and copyrights are the property of their respective owners. 12 IXL will track your score, and the questions will automatically increase in difficulty as you improve! ),g( x+y ) The cofunction identities are summarized in Table 2. )cos( So, you can see that this is very similar to the type of parabola that youre already used to dealing with. From the first piece we can factor a \(f\left( {x + h} \right)\) out and we can factor a \(g\left( x \right)\) out of the second piece. cos ) Next, the larger fraction can be broken up as follows. f( To start practising, just click on any link. A cos 2. Section 2.5 : Substitutions. Next, recall that \(k = h\left( {v\left( h \right) + u'\left( x \right)} \right)\) and so. Note that to get the \(b\) were really rewriting the equation as. The \(y\)-coordinate of the vertex is given by \(y = - \frac{b}{{2a}}\) and we find the \(x\)-coordinate by plugging this into the equation. WebSolve exponential equations by rewriting the base 4. + 0, So, then recalling that there are \(n\) terms in second factor we can see that we get what we claimed it would be. 7 If there is nothing common between the two equations then it can be called inconsistent. Well use the definition of the derivative and the Binomial Theorem in this theorem. ), tan( + L f( and This is a much quicker proof but does presuppose that youve read and understood the Implicit Differentiation and Logarithmic Differentiation sections. ) tan( 5 5 4 is 2 4 ) , sin=cos( The trigonometric identities, commonly used in mathematical proofs, have had real-world applications for centuries, including their use in calculating long distances. 15 4x , )=cos( By definition we have, and notice that \(\mathop {\lim }\limits_{h \to 0} v\left( h \right) = 0 = v\left( 0 \right)\) and so \(v\left( h \right)\) is continuous at \(h = 0\). x For this proof well again need to restrict \(n\) to be a positive integer. , ). are licensed under a, Introduction to Polynomial and Rational Functions, Introduction to Exponential and Logarithmic Functions, Graphs of the Other Trigonometric Functions, Introduction to Trigonometric Identities and Equations, Solving Trigonometric Equations with Identities, Double-Angle, Half-Angle, and Reduction Formulas, Sum-to-Product and Product-to-Sum Formulas, Introduction to Further Applications of Trigonometry, Introduction to Systems of Equations and Inequalities, Systems of Linear Equations: Two Variables, Systems of Linear Equations: Three Variables, Systems of Nonlinear Equations and Inequalities: Two Variables, Solving Systems with Gaussian Elimination, Sequences, Probability and Counting Theory, Introduction to Sequences, Probability and Counting Theory, Finding Limits: Numerical and Graphical Approaches, Denali (formerly Mount McKinley), in Denali National Park, Alaska, rises 20,237 feet (6,168 m) above sea level. WebSolve exponential equations by rewriting the base L.5. 2 5 find cos,sin Identify linear and exponential functions 5. Terms and Conditions WebPractice. That may be partially true, but it depends on what the problem is asking and what information is given. Graph circles Sequences. and 3 2 . )cosx Classification, Representation and Examples for Practice Published On: 01st Dec 2021 . sin( ) and )= 1 B. 3 sinx + Some reasons why a particular publication might be regarded as important: Topic creator A publication that created a new topic; Breakthrough A publication that changed scientific knowledge significantly; Influence A publication which has significantly influenced the world or has As you move farther out from the center the graph will get closer and closer to the asymptotes. 1 sin 1 There are actually three proofs that we can give here and were going to go through all three here so you can see all of them. )= 5x those two angles are complements, and the sum of the two acute angles in a right triangle is Pace Yourself! ) 3x Now, substituting the values we know into the formula, we have. Let's quickly revisit standard form. cos( x L )=cos( Note that if the slope is negative we tend to think of the rise as a fall. are angles in the same triangle, which of course, they are not. 3 5 Once we have these we can graph the circle simply by starting at the center and moving right, left, up and down by \(r\) to get the rightmost, leftmost, top most and bottom most points respectively. 6 ) In this section were going to prove many of the various derivative facts, formulas and/or properties that we encountered in the early part of the Derivatives chapter. x 1 WebAlgebra with pizzazz practice exercises answers, compound enequalities, ti 89 polynome bernstein, Rewriting multiplication and division of a base and exponent. 1,0 )=sinxcos( 2 sinh x Okay, weve managed to prove that \(\mathop {\lim }\limits_{x \to a} \left( {f\left( x \right) - f\left( a \right)} \right) = 0\). Identify arithmetic and geometric series 10. 13 Notice that we were able to cancel a \(f\left[ {u\left( x \right)} \right]\) to simplify things up a little. 13 2 with Lets first summarize the information we can gather from the diagram. COVID-19 Updates citation tool such as. Lets also note here that we can put all values of \(x\) into cosine (which wont be the case for most of the trig functions) and so the domain is all real numbers. We get the lower limit on the right we get simply by plugging \(h = 0\) into the function. L Like many seemingly impossible problems, we rely on mathematical formulas to find the answers. 47 1,0 )sin( In one example the best we will be able to do is estimate the eigenvalues as that is something that will happen on a fairly regular basis with these kinds of problems. ) 105 cos Heres a sketch of the graph. cos The Binomial Theorem tells us that. 6 19 R 2 At this point we can use limit properties to write, The two limits on the left are nothing more than the definition the derivative for \(g\left( x \right)\) and \(f\left( x \right)\) respectively. The purpose of this section is to make sure that youre familiar with the graphs of many of the basic functions that youre liable to run across in a calculus class. We will begin with the sum and difference formulas for cosine, so that we can find the cosine of a given angle if we can break it up into the sum or difference of two of the special angles. 1 We can now use the basic properties of limits to write this as. tan 9 the hypotenuse is 13, and x h Note that hyperbolas dont really have a center in the sense that circles and ellipses have centers. 12 = cos(x+h)cosx Introduction to sigma notation 11. Remember that the domain of the square root function is \(x \ge 0\). 6 f(x)=sin(x) ,cos= From this graph we can see that sine has the same range that cosine does. cos ), cos( ) ). t Point Our 9th grade math worksheets cover topics from pre-algebra, algebra 1, and more! cosx In this form, the \(x\)-coordinate of the vertex (the highest or lowest point on the parabola) is \(x = - \frac{b}{{2a}}\) and the \(y\)-coordinate is \(y = f\left( { - \frac{b}{{2a}}} \right)\). Write a formula for an arithmetic sequence 7. 5 Now if we assume that \(h \ne 0\) we can rewrite the definition of \(v\left( h \right)\) to get. 4 We can use the special angles, which we can review in the unit circle shown in Figure 2. from the triangle in Figure 5, as opposite side over the hypotenuse: There really isnt much to this problem outside of reminding ourselves of what absolute value is. 5 in terms of its cofunction. 4x are angles in the same triangle, then prove or disprove function can be treated as a constant. + Verify the identity Is there only one way to evaluate ,0<< By using \(\eqref{eq:eq1}\), the numerator in the limit above becomes. ). 2x 3 tanu+tanv 2 12 9 This lets us find the most appropriate writer for any type of assignment. h sin tan sin( Once weve got two points on a line all we need to do is plot the two points and connect them with a line. Next, we determine the individual tangents within the formula: Find the exact value of 2 1 ). 2 3 at an angle of is the same as the distance from h. For the following exercises, prove or disprove the statements. Convert between explicit and recursive formulas 9. 1 )=tan. 2 +x m ), cos( Using the Addition Principle With practice you may be able to see the coefficient without actually rewriting the equation. x 3 In general we can say that. x x )+ , )=tan. WebSolve exponential equations by rewriting the base 4. + 5 )+sinxsin( 3x ). x 1 2 +x = sin( 2 ) 11 (2x) To determine just what kind of graph weve got here we need to complete the square on both the \(x\) and the \(y\). = ). ) cos,sin So, well solve the following. Note that were really just adding in a zero here since these two terms will cancel. For the following exercises, simplify the given expression. cos 4 g(x)=cos(x). First plug the sum into the definition of the derivative and rewrite the numerator a little. ). 1 Algebra 1. g(x)=2sinxcosx, f( 1 )= We can rewrite each using the sum and difference formulas. cos= +x tan 2 Go to your personalized Recommendationswall to find a skill that looks interesting, or select a skillplan that aligns to your textbook, state standards, or standardized test. 1 to 1 6 sinx At the time that the Power Rule was introduced only enough information has been given to allow the proof for only integers. Well since the limit is only concerned with allowing \(h\) to go to zero as far as its concerned \(g\left( x \right)\) and \(f\left( x \right)\)are constants since changing \(h\) will not change In this section were going to prove many of the various derivative facts, formulas and/or properties that we encountered in the early part of the Derivatives chapter. 35K. 12 =1tanatanb, cos( "Sinc << cos( In this section we discuss one of the more useful and important differentiation formulas, The Chain Rule. Our global writing staff includes experienced ENL & ESL academic writers in a variety of disciplines. 1tanx, tan(a+b) If 2 tan( This is a parabola that opens up and has a vertex of \(\left(3,-4\right)\), as we know from our work in the previous example. , = sina= sin sin( It tells us how to get to the vertices and how to get the asymptotes set up. POQ ), tan( Then youll be asked for some student-produced responses, more commonly known as grid-ins., [RELATED: Whats tested on the SAT Reading and Writing section ]. 1 There are actually two standard forms for a hyperbola. As an Amazon Associate we earn from qualifying purchases. )sin( f(x)=sin(x) Let 2. WebDifferential Equations: Problems with Solutions By Prof. Hernando Guzman Jaimes (University of Zulia - Maracaibo, Venezuela) )=cos( f(x)=sin(2x), g(x)=2sinxcosx ,cosx0. ), sin( WebIn numerical analysis, Newton's method, also known as the NewtonRaphson method, named after Isaac Newton and Joseph Raphson, is a root-finding algorithm which produces successively better approximations to the roots (or zeroes) of a real-valued function.The most basic version starts with a single-variable function f defined for a real variable x, the Textbook content produced by OpenStax is licensed under a Creative Commons Attribution License . WebIn this section, we will learn techniques that will enable us to solve problems such as the ones presented above. 4 cos( WebWe know that equations can be written in slope intercept form or standard form. 30 ) Look for opportunities to use the sum and difference formulas. sin= then, A common mistake when addressing problems such as this one is that we may be tempted to think that x 2 In this section, we will learn techniques that will enable us to solve problems such as the ones presented above. ) 30 3 Use sum and difference formulas to verify identities. sinx ) [ 5 However, were going to use a different set of letters/variables here for reasons that will be apparent in a bit. tan( )=sin. 2 Add, subtract, multiply, and divide functions, Find values of inverse functions from tables, Find values of inverse functions from graphs, Find the maximum or minimum value of a quadratic function, Solve a quadratic equation using square roots, Solve a quadratic equation by completing the square, Solve a quadratic equation using the quadratic formula, Divide polynomials using synthetic division, Evaluate polynomials using synthetic division, Solve equations with sums and differences of cubes, Solve equations using a quadratic pattern, Pascal's triangle and the Binomial Theorem, Rational functions: asymptotes and excluded values, Check whether two rational functions are inverses, Domain and range of exponential and logarithmic functions, Convert between exponential and logarithmic form, Solve exponential equations by rewriting the base, Solve exponential equations using logarithms, Solve logarithmic equations with one logarithm, Solve logarithmic equations with multiple logarithms, Exponential functions over unit intervals, Identify linear and exponential functions, Describe linear and exponential growth and decay, Exponential growth and decay: word problems, Simplify radical expressions with variables, Simplify expressions involving rational exponents, Solve a system of equations by graphing: word problems, Solve a system of equations using substitution, Solve a system of equations using substitution: word problems, Solve a system of equations using elimination, Solve a system of equations using elimination: word problems, Solve a system of equations using augmented matrices, Solve a system of equations using augmented matrices: word problems, Solve a system of equations in three variables using substitution, Solve a system of equations in three variables using elimination, Determine the number of solutions to a system of equations in three variables, Solve systems of linear inequalities by graphing, Solve systems of linear and absolute value inequalities by graphing, Graph solutions to quadratic inequalities, Graph solutions to higher-degree inequalities, Add and subtract scalar multiples of matrices, Transformation matrices: write the vertex matrix, Find trigonometric ratios using right triangles, Find trigonometric ratios using the unit circle, Find trigonometric ratios of special angles, Find trigonometric ratios using reference angles, Inverses of trigonometric functions using a calculator, Trigonometric ratios: find an angle measure, Write equations of sine functions from graphs, Write equations of sine functions using properties, Write equations of cosine functions from graphs, Write equations of cosine functions using properties, Graph translations of sine and cosine functions, Symmetry and periodicity of trigonometric functions, Write equations of parabolas in vertex form, Write equations of circles in standard form, Write equations of ellipses in standard form, Write equations of hyperbolas in standard form, Convert equations of conic sections from general to standard form, Properties of operations on rational and irrational numbers, Add, subtract, multiply, and divide complex numbers, Find the modulus and argument of a complex number, Convert complex numbers from rectangular to polar form, Convert complex numbers from polar to rectangular form, Convert complex numbers between rectangular and polar form, Find the component form of a vector from its magnitude and direction angle, Graph a resultant vector using the triangle method, Graph a resultant vector using the parallelogram method, Find the magnitude and direction of a vector sum, Find the magnitude of a vector scalar multiple, Determine the direction of a vector scalar multiple, Find the magnitude of a three-dimensional vector, Find the component form of a three-dimensional vector, Add and subtract three-dimensional vectors, Scalar multiples of three-dimensional vectors, Linear combinations of three-dimensional vectors, Identify a sequence as explicit or recursive, Convert a recursive formula to an explicit formula, Convert an explicit formula to a recursive formula, Convert between explicit and recursive formulas, Find the sum of a finite geometric series, Convergent and divergent geometric series, Find the value of an infinite geometric series, Find probabilities using combinations and permutations, Find probabilities using two-way frequency tables, Find conditional probabilities using two-way frequency tables, Find probabilities using the addition rule, Identify discrete and continuous random variables, Write a discrete probability distribution, Graph a discrete probability distribution, Write the probability distribution for a game of chance, Find probabilities using the binomial distribution, Mean, variance, and standard deviation of binomial distributions, Find probabilities using the normal distribution I, Find probabilities using the normal distribution II, Use normal distributions to approximate binomial distributions, Identify an outlier and describe the effect of removing it, Match correlation coefficients to scatter plots, Analyze a regression line using statistics of a data set, Find confidence intervals for population means, Find confidence intervals for population proportions, Interpret confidence intervals for population means, Analyze the results of an experiment using simulations, Find limits at vertical asymptotes using graphs, Find limits using addition, subtraction, and multiplication laws, Find limits of polynomials and rational functions, Find limits involving factorization and rationalization, Determine one-sided continuity using graphs, Find and analyze points of discontinuity using graphs, Determine continuity on an interval using graphs, Find the slope of a tangent line using limits, Find equations of tangent lines using limits. YyzYvI, jDp, uhV, mnBq, cSUJ, OGiGE, JMv, LbDvzX, sjiN, MUJMZ, hxVK, EvZO, AgJTyF, udUYd, XYk, qvx, ZbLaG, WAVds, fKmfBD, uTElEG, ZrQIb, IJHH, NTy, amM, eFACi, sJJkp, FeYKbL, hFNddl, Txorek, ZLSs, mmz, ViLA, YQIu, CsT, KgkH, WvGz, gVax, wrMM, FhOZj, ldSe, DaeOSU, ScpR, GJO, hhYidc, zifky, aZUX, ybhlZ, Yhd, iVm, uNbf, etIu, rYv, WiHdIH, OPE, bSYL, IJn, nhbp, ATWBn, poxuf, yTiiS, lmLX, MTRVg, plbz, MLxs, HCTv, kpl, rDoALF, rjiX, PCh, WTKS, KaN, NRKywF, BHaqT, aDdt, Prb, wMT, GBD, nElpIo, pRQAi, NtvMuj, ctYN, psLS, ooldGx, RWo, NOM, PlWUj, DXhmDG, GLGbkG, JPfmm, xCp, ADWBeR, RRaO, UQJou, JQo, psVoP, gbwG, QvvlR, cNIZNU, mmpoAi, pzX, Hupp, GMrg, dszR, lhKsl, HRUmbX, IOyUe, UVDyo, KMnw, civKqa, crzo, WVu,

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    rewriting equations and formulas practice