Hey guy i gt this questions on integration which i am not sure how to approach. I have uploaded the question via jpg file.
For the first questions i attempted to intergrate by parts and let u=e^tanx
du= tane^tanx.dx, dv/dx = cos^2x and v = (sin^3x)/3, am i correct so far?
As a results i was left with:
e^tanx . (sin^3x/3) - Int (sin^3X/3) . tane^tanx
what do i do now if in fact i am on the correct path i would assume to integrate it again but that seems too difficult and deafeats the purpose of the IBP. Was i supposed to use IBP? Any help would be greatly appreciated.