Q. 13

If cot (α + β) = 0, then write the value of sin (α + 2β).

Answer :

Given: cot(α + β) = 0



cotα.cotβ = 1




Now,


Sin(α +2β ) = sinα.cos2β + cosα.sin2β


=sin α (2 cos2 β-1)+cos α.2 sin β.cos β


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