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int(1-tanx)/(1+tanx)dx=........

`int(1-tanx)/(1+tanx)dx=.....`

A

`log sec((pi)/(4)-x)+c`

B

`log sec((pi)/(4)+x)+c`

C

`log sin((pi)/(4)+x)+c`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
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