f(x)=tan^(-1)(sinx+cosx), x gt0 is alway...

`f(x)=tan^(-1)(sinx+cosx), x gt0` is always and increasing function on the interval

A

`(0, pi)`

B

`(0, pi//2)`

C

`(0, pi//4)`

D

`(0, 3pi//4)`

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The correct Answer is:

C

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