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If cot(alpha+beta)=0\ t h e n\ "sin"(alp...

If `cot(alpha+beta)=0\ t h e n\ "sin"(alpha+2beta)` is equal to a. `sinalpha` b. `cos2beta` c. `cosalpha` d. `sin2alpha`

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Given

` y = sin2 α + cos2 (α+β) + 2 sin α sin β cos (α+β)` We know

Given

`y = sin2 α + cos2 (α+β) + 2 sin α sin β cos (α+β)`

We know

`2 sin A sin B = cos (A-B) – cos (A+B)`

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