# Math Is Fun Forum

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## #1 2019-01-17 16:56:36

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

### Integration

Exercising this type of integration questions
Q. integral from 0 to pi\4 ln(1+tanx)

Malik

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## #2 2019-01-17 22:19:59

Bob
Registered: 2010-06-20
Posts: 9,428

### Re: Integration

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

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## #3 2019-01-18 03:03:53

zetafunc
Moderator
Registered: 2014-05-21
Posts: 2,383
Website

### Re: Integration

Set

then use the trig identity

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## #4 2019-01-18 19:27:55

Bob
Registered: 2010-06-20
Posts: 9,428

### Re: Integration

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

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## #5 2019-01-25 11:16:35

zetafunc
Moderator
Registered: 2014-05-21
Posts: 2,383
Website

### Re: Integration

Hi Bob,

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

https://youtu.be/IwmYetE29YU

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## #6 2019-09-28 18:58:03

yuliani37
Member
Registered: 2019-09-28
Posts: 2