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

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

A

`0ltxltpi/8`

B

`pi/4ltxlt(3pi)/8`

C

`(3pi)/8ltxlt(5pi)/8`

D

`(5pi)/8ltxlt(3pi)/4`

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The correct Answer is:

B

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