u substitution problem  integration
Find the indefinite integral for sec^3x*tanx using u substitution.
I've done pretty well solving u substitution problems up to this point, but this problem continues to stump me; there is something I am missing.
let u=tanx
du = sec^2x*dx
I figure that maybe I can "break apart" the sec^3x term into sec^2x*secx, giving me the following:
sec^2x*secx*u*dx
But du=sec^2dx so substituting gives secx*u*du
But I can't find the anti derivative of this
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