The function f: R -> R is defined by f(x...

The function `f: R -> R` is defined by `f(x) = cos^2x + sin^4x` for `x in R`. Then `f(R)` is

A

`((3)/(4),1]`

B

`[(3)/(4),1)`

C

`[(3)/(4),1]`

D

`((3)/(4),1)`

Verified by Experts

The correct Answer is:

C

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