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If f(x) =sin^(4)x+cos^(4)x increases if...

If `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)`

Text Solution

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The correct Answer is:
B
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