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

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

A

`0 lt x lt pi/8`

B

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

C

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

D

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

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The correct Answer is:

B

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