int ((cos2x)/(sinx+cosx)^2) dx is equal ...

`int ((cos2x)/(sinx+cosx)^2) dx` is equal to:

A

`-1/(sinx+cosx)^2`

B

log|sinx+cosx|+C

C

log|sinx-cosx|+C

D

`1/(sinx+cosx)^2`.

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