Question

\[\int\limits 5 (\sin5\theta) (\sin \theta) d \theta\]

Answer 1

take integral by part twice, you get the original problem at both sides. Then, just stay them in one side, calculate the rest.

Answer 2

somehow i got 1/40 sin 4theta - 1/60 sin 6theta. says im wrong

Answer 3

I don't know, you should show your work to be checked.