SOLUTION: I am getting stuck please show steps Evaluate the intergral x cos 15x dx

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Question 878244: I am getting stuck please show steps
Evaluate the intergral
x cos 15x dx
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use integration by parts,
int%28u%2Cdv%29=uv-int%28v%2Cdu%29
Let
dv=cos%2815x%29dx
u=x
Then,
v=%281%2F15%29sin%2815x%29
du=dx
So then,
int%28u%2Cdv%29=uv-int%28v%2Cdu%29