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Let f be a function defined on [-pi/2, p...

Let f be a function defined on `[-pi/2, pi/2]` by `f(x) = 3cos^(4)x - 6 cos^(3)x -3` Then the range of `f(x)` is

A

`[-12,-3]`

B

`[-6,-3]`

C

`[-6,3)`

D

`(-12,3]`

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A
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