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 cos^{2} β-1)+cos α.2 sin β.cos β

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