\[\int_{{}}^{{}}{\frac{1-\tan x}{1+\tan x}\ dx=}\] [MP PET 1994]

1.	\[\int_{{}}^{{}}{\frac{1-\tan x}{1+\tan x}\ dx=}\] [MP PET 1994]
A.	\[\log \sec \left( \frac{\pi }{4}-x \right)+c\]
B.	\[\log \cos \left( \frac{\pi }{4}+x \right)+c\]
C.	\[\log \sin \left( \frac{\pi }{4}+x \right)+c\]
D.	None of these
Answer» D. None of these

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\[\int_{{}}^{{}}{\frac{1-\tan x}{1+\tan x}\ dx=}\] [MP PET 1994]

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