Q11 of 180 Page 2

If cos(α + β) = 0, then sin(α + β) is equals to _______ .

Given: cos(α + β) = 0


We can write, cos(α + β)= cos 90° (∵ cos 90° = 0)


By comparing cosine equation on either sides,


We get(α + β)= 90°


⇒ sin(α + β) = 1


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