For some reason I am having trouble with the integral: sin2xcos2x dx
I have tried a few identities with no luck.
(1/2) | (2sinxcosx)2 dx
(1/4) | (1 - cos(2x))(1 + cos(2x)) dx
The website I am looking at keeps saying to use integration by parts, which makes no sense to me.
Thanks for your help.