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Calculus: Early Transcendentals
8th Edition
ISBN: 9781285741550
Author: James Stewart
Publisher: Cengage Learning
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
Transcribed Image Text:3. You are working with your friends Alice and Bob on your Calculus homework. While you were away running
an errand, they computed the integral / 2 sinxcosxdx, but they cannot agree on the correct answer.
Alice made the substitution u =
sinx with du = cosxdx, and then wrote:
2 sinxcosxdx = | 2 sinx(cos.xdx) = / 2udu = u? +C = sin?x+C.
Bob made the substitution u = cosx with du = – sinxdx, and then wrote:
2 sinxcosxdx = | 2cosx (sinxdx) = | 2u(-du) = -ư² +C=- cos?x+C.
Did one of your friends make a mistake? If yes, who made a mistake and where is the mistake? If you think
neither of them made a mistake, then address their concern:"How can you have two different-looking correct
answers for the same integral"?
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