# Integration Problem.

1. Feb 26, 2005

### flying2000

integrate ln(tanx)/sinxcosx dx
I want to change to integrate csc2x ln(tanx) dx , still can't work it out.
Any suggestions?
THX

2. Feb 26, 2005

### dextercioby

$$\int \frac{\ln(\tan x)}{\sin x\cos x} dx$$ can be integrated very easily if u multiply both the denominator & the numerator by \cos x and make the substitution \tan x -------->u and then a simple part integration...

Daniel.

3. Feb 26, 2005

### Muzza

Or you could try the substitution u = ln(tan(x)).

4. Feb 26, 2005

### flying2000

Thanks so much. I got it!

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