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

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 3 pi//8` c)`3 pi//8 lt x lt 5pi//8` d)`5 pi//8 lt x lt 3 pi//4`

A

`0 lt x lt pi//8`

B

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

C

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

D

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

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The correct Answer is:

B

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