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

If `sin(theta+alpha)=a and sin (theta+ beta)` , then `cos2(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`

Text Solution

Verified by Experts

The correct Answer is:
B
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