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

If `sin(theta+alpha)=a` and `sin(theta+beta)=b` then `cos2(alpha-beta)-4abcos(alpha-beta)` is equal to

A

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

B

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

C

3) `2+a^2+b^2`

D

4) `2-a^2-b^2`

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