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The function f:R rarrR defined by f(x)=c...

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

A

`(3//4, 1)`

B

`[3//4, 1)`

C

`[3//4, 1]`

D

`(3//4, 1)`

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