int(sec^(2)x)/((1+tanx))dx...

`int(sec^(2)x)/((1+tanx))dx`

A

`logabs(cosx+sinx)+c`

B

`logabs(sec^(2)x)+c`

C

`logabs(1+tanx)+c`

D

`-1/(1+tanx)^(2)+c`

Verified by Experts

The correct Answer is:

C

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