(a) Find the derivatives of sin(x2 +1) and sin(x3+1). (b) Use your answer to part (a) to find antiderivatives of: (i) x cos(x2 + 1) (ii) x2 cos(x3 + 1) (c) Find the general antiderivatives of: (i) x sin(x2 + 1) (ii) x2 sin(x3 +1)
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Textbook Solutions for Applied Calculus
Question
(a) Find = sin cos d. (b) You probably solved part (a) by making the substitution w = sin or w = cos. (If not, go back and do it that way.) Now find = sin cos d by making the other substitution. (c) There is yet another way of finding this integral which involves the trigonometric identities sin(2) = 2sin cos cos(2) = cos2 sin2 . Find = sin cos d using one of these identities and then the substitution w = 2. (d) You should now have three different expressions for the indefinite integral = sin cos d. Are they really different? Are they all correct? Explain.
Solution
The first step in solving 6.6 problem number 66 trying to solve the problem we have to refer to the textbook question: (a) Find = sin cos d. (b) You probably solved part (a) by making the substitution w = sin or w = cos. (If not, go back and do it that way.) Now find = sin cos d by making the other substitution. (c) There is yet another way of finding this integral which involves the trigonometric identities sin(2) = 2sin cos cos(2) = cos2 sin2 . Find = sin cos d using one of these identities and then the substitution w = 2. (d) You should now have three different expressions for the indefinite integral = sin cos d. Are they really different? Are they all correct? Explain.
From the textbook chapter INTEGRATION BY SUBSTITUTION you will find a few key concepts needed to solve this.
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