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The minimum vallue of f(x) = sin^(4)x +...

The minimum vallue of `f(x) = sin^(4)x + cos^(4)x, 0 le x le 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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