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The value of "cos"^(2)(pi)/(12)+"cos"^(2...

The value of `"cos"^(2)(pi)/(12)+"cos"^(2)(pi)/(4)+"cos"^(2)(5pi)/(12)` is

A

`2/3`

B

`(2)/(3+sqrt(3))`

C

`(3)/(2)`

D

`(3+sqrt(3))/(2)`

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