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

The function `f: R-R` is defined by `f(x)=cos^2x+sin^4xforx in Rdot` Then the range of `f(x)` is `(3/4,1]` (b) `[3/4,1)` (c) `[3/4,1]` (d) `(3/4,1)`

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