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f(x) = tan^(-1) (sin x + cos x) એ .........

`f(x) = tan^(-1) (sin x + cos x)` એ ............ માં ચુસ્ત વધતું વિધેય છે.

A

`(pi/4,pi/2)`

B

`(-pi/2,pi/4)`

C

`(0,pi/2)`

D

`((-pi/2,pi/2)`

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