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The extreme values of 4cos(x^(2)).cos((...

The extreme values of `4cos(x^(2)).cos((pi)/(3)+x^(2)).cos((pi)/(3)-x^(2))` are

A

`-1, 1`

B

`-2,2`

C

`-3, 3`

D

`-4, 4`

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The correct Answer is:
A
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