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The value of "2sin"^(2)(pi)/(3)-"cos"^(2...

The value of `"2sin"^(2)(pi)/(3)-"cos"^(2)(pi)/(6)+"tan"^(2)(pi)/(6)` is equal to
A.`7/12` B.`13/12`
C.`13/4` D.-`13/12`

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