I have trouble solving I tried using u substitution many times and trying to use the identities but I can not some how figure it out. Can someone show me?
I have trouble solving I tried using u substitution many times and trying to use the identities but I can not some how figure it out. Can someone show me?
You don't want u-substitution. We have the trig identity: $\displaystyle \cos(2x)=2\cos^2(x)-1$. Therefore,