I found a way on Google like this https://www.quora.com/What-is-the-integration-of-log-1+tanx

sorry if my answer is wrong]]>

I made a video explanation here, if Zeeshan 01 would like to have a look.

]]>Zeeshan 01: After a bit of research I think I can take you through this, but it'll take more than one post. If you would like that please reply. Or you could do like me and use a search engine.

Bob

]]>then use the trig identity

]]>Wow! Where did that come from? Not out of a beginners book of integration, I hope. I couldn't see how to do it, so I used https://www.wolframalpha.com/ to compute it. It has a far from easy solution as you'll see. Did you just make this one up yourself? That's a hazard with trying that. Not all functions are easily integrable.

Bob

]]>Q. integral from 0 to pi\4 ln(1+tanx)]]>