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Let f(x) =sin^4x+cos^4x. Then f is incre...

Let `f(x) =sin^4x+cos^4x.` Then f is increasing function in the interval

A

`](5pi)/(8), (3pi)/(4)[`

B

`](pi)/(2), (5pi)/(8)[`

C

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

D

`]0, (pi)/(4)[`

Text Solution

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The correct Answer is:
C
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