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.
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
1 answer
1 answer