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The minimum value of f(x)-sin^(4)x+cos^(...

The minimum value of `f(x)-sin^(4)x+cos^(4)x,0lexle(pi)/(2)` is

A

`(1)/(2sqrt2)`

B

`1/4`

C

`-1/2`

D

`1/2`

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The correct Answer is:
D
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