indefinite-integration

Question: $\int_{{}}^{{}}{\frac{1-\tan x}{1+\tan x}\ dx=}$



1) $\log \sec \left( \frac{\pi }{4}-x \right)+c$
2) $\log \cos \left( \frac{\pi }{4}+x \right)+c$
3) $\log \sin \left( \frac{\pi }{4}+x \right)+c$
4) None of these
Solution: Explanation: No Explanation
Fundamental integration

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