Here's the question you clicked on:
supercrazy92
\[\int\limits_{}^{}\tan^3x secx dx \]
first, change tan^3 x = tan^2x tanx
I tried this \[\int\limits_{}^{}(\tan^2x. tanx. secx) dx \] \[\int\limits_{}^{}(\sec^2x-1) (tanx. secx) dx \]
Yeah, continue with that and set u = sec x du = sec x tan x
ok, then multiply of them by use distributive property = int (sec^2x secxtanx - secxtanx) dx = int (sec^2x secxtanx) dx - int (secxtanx) dx
case I : int (sec^2x secxtanx) dx use int by subs, like slaaibak said : u=secx case II : int (secxtanx) = secx (i sure u have remembered) :p
I think I do :) thanks @RadEn and @slaaibak