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The function f(x) = sin x + cos x will b...

The function `f(x) = sin x + cos x` will be

A

It is increasing in the interval `(0,pi/2)`

B

It remain constant in the interval `(0,pi/2)`

C

It is decreasing in the interval `(0,pi/2)`

D

It is decreasing in the interval `(-pi/2, pi/2)`

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The correct Answer is:
A
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