frac(cos60^@ + sin 60^@)(cos60^@- sin 60...

`frac(cos60^@ + sin 60^@)(cos60^@- sin 60^@)` is equal to
(A) `-(sqrt3 +2)` (B) -1 (C ) `(sqrt3 -2)` (D) (sqrt3 + 2)`

A

B

A

C

D

C

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