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

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

A

`0ltxltpi//8`

B

`pi//4ltxlt3pi//8`

C

`3pi//8ltxlt5pi//8`

D

`5pi//8ltxlt3pi//4`

Text Solution

Verified by Experts

The correct Answer is:
B
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