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

फलन `f(x) = tan^(-1) ( sin x+ cos x)` किस अन्तराल में वर्धमान फलन है -

A

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

B

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

C

`(0, pi//2)`

D

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

लिखित उत्तर

Verified by Experts

The correct Answer is:
B
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