Posted by Anonymous on Friday, April 22, 2011 at 6:39am.
INTEGRATE tan4x with respect to x

calculus  drwls, Friday, April 22, 2011 at 7:07am
let 4x = u
dx = du/4
integral of tan 4x* dx =
(1/4) integral of tan u du
= (1/4) log(cosu)
= (1/4) log(cos4x)