integral of sin^4 (x) * cos^4 (x)
I tried a bunch of u substitutions but nothing so far has worked. I know that sin^2 x + cos^2 x = 1 and that cos2x = 2cos^2 (x) - 1 = 1-2sin^2 (x) and I can solve either of these for sin^2 (x) or cos^2 (x). Will any of this help me? Thanks.