1.

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

Answer»

`1 - a^(2) - B^(2)`
`1 - 2A^(2) - 2B^(2)`
`2 + a^(2) - b^(2)`
`2 - a^(2) - b^(2)`

ANSWER :B


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