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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 (pi)/2`

C

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

D

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

Text Solution

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The correct Answer is:
B
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