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(cos 252^@ - sin 126^@)(cos 252^@ + sin ...

`(cos 252^@ - sin 126^@)(cos 252^@ + sin 126^@)( sin^2 126^@ + sin^2 186^@+sin^2 66^@)=`

A

`(3sqrt(5))/(8)`

B

`(-3sqrt(5))/(8)`

C

`(-3(sqrt5))/(4)`

D

`3(sqrt(5))/(4)`

Text Solution

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The correct Answer is:
B
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