The function f: R rarr R is defined by f...

The function `f: R rarr R` is defined by `f(x)=cos^(2)x+sin^(4) x ` for `x in R`. Then the range of `f(x)` is

A

`(3/4, 1]`

B

`(3/4, 2)`

C

`[3/4, 1]`

D

`(3/4, 1)`

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The correct Answer is:

C

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