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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 740

Exercising this type of integration questions

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

M.M.Zeeshan.K

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,524

hi Zeeshan 01

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

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Sometimes I deliberately make mistakes, just to test you! …………….Bob Bundy

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Set

then use the trig identity

**LearnMathsFree: Videos on various topics.New: Integration Problem | Adding FractionsPopular: Continued Fractions | Metric Spaces | Duality**

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,524

Thanks zetafunc. It seems that the limits make all the difference.

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

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Sometimes I deliberately make mistakes, just to test you! …………….Bob Bundy

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Hi Bob,

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

**LearnMathsFree: Videos on various topics.New: Integration Problem | Adding FractionsPopular: Continued Fractions | Metric Spaces | Duality**

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