Asked by maria

prove the following integrals:

a)sin3xcos7xdx = -1/20cos(10x)+1/8cos(4x)

i know i have asked this question before but i am very confused bobpursley, can you please show me the steps of proves.
thanks in advanced

Answers

Answered by bobpursley
This is all trig.
Sum formulas for sine and cosine
sin (s + t) = sin s cos t + cos s sin t

cos (s + t) = cos s cos t – sin s sin t

Use those formulas on the left, simplify, then do the integral. Is is mostly messy algebra, and a minimal amount of calculus.
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