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The extreme values of sin^(2) ((pi)/(3...

The extreme values of `sin^(2) ((pi)/(3)+x) + sin^(2) ((pi)/(3) -x) ` is

A

`(1)/(2),(3)/(2)`

B

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

C

`(3)/(2).(5)/(2)`

D

`(1)/(4),(5)/(4)`

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