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

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

A

`sec^(2)((pi)/(4)-x)+c`

B

`log(secx-sinx)+c`

C

`log(sinx+cosx)-k`

D

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

Text Solution

Verified by Experts

The correct Answer is:
C
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