Wednesday, February 21, 2018

integration - Evaluation of the integral intfracx+sinx1+cosxmathrmdx by parts

I have to evaluate the following integral by parts: x+sinx1+cosxdx



So I tried to put:



u=x+sinx   du=(1+cosx)dx




dv=dx1+cos(x) v=dx1+cosx



But there is an extra integral to do ( the v function) I evaluated it by sibstitution, and I get v=tanx2, Now



x+sin(x)1+cos(x)dx=(x+sinx)tanx2x+C


My question: is it possible to evaluate this integral entirely by parts (without using any substitution) ?



I appreciate any ideas

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