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

The function `f(x)=sin^4x+cos^4x` increasing if `0

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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