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If f(x) = sin^(4)x + cos^(4)x - 1/2 sin ...

If `f(x) = sin^(4)x + cos^(4)x - 1/2 sin 2x`, then the range of f(x) is:

A

`[0,3/2]`

B

`[-1/2, 7/2]`

C

`[0,9/8]`

D

`[3/4, 7/8]`

Text Solution

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The correct Answer is:
C
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