If sin (theta + alpha) = a and sin (thet...

If `sin (theta + alpha) = a and sin (theta + beta) = b,"then" cos 2 (alpha - beta) - 4ab cos (alpha - beta) =`

A

`1 - a^(2) - b^(2)`

B

`1 - 2a^(2) - 2b^(2)`

C

`2 + a^(2) - b^(2)`

D

`2 - a^(2) - b^(2)`

Verified by Experts

The correct Answer is:

B

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