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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

`0ltxltpi//8`

B

`pi//4ltxlt3pi//8`

C

`3pi//8ltxlt5pi//8`

D

`5pi//8ltxlt3pi//4`

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