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The function f(x)=sin^4x+cos^4x increasi...

The function `f(x)=sin^4x+cos^4x` increasing if `0

A

`0 lt x lt pi//8`

B

`pi//4 lt x lt 3pi //8 `

C

`3pi//8 lt x lt 5 pi //8`

D

`5pi//8 lt x lt 3 pi //4`

Text Solution

Verified by Experts

The correct Answer is:
B
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