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If 3sinbeta=sin(2alpha+beta) then...

If `3sinbeta=sin(2alpha+beta)` then

A

`(cot alpha+cot(alpha+beta))(cot beta-3cot(2alpha-beta))=6`

B

`sin beta=cos(alpha+beta)sin alpha`

C

`tan(alpha+beta)=2tan alpha`

D

`2sin beta=sin(alpha+beta)cos alpha`

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The correct Answer is:
A, B, C, D
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