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I don't know how to find this primitive function:

[tex]

\int \frac{dx}{(1+\tan x)(1+\tan^2 x)}

[/tex]

I tried substitutions [itex]t = \tan x[/itex] or [itex]t = 1 + \tan x[/itex], but it didn't seem to help me lot...

Could someone please point me to the right direction?

Thank you.

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# Primitive function

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