Question

if cos (90°-A) =0,then sin (A+B)=​

Answer 1

Step-by-step explanation:

cos(α+β)=0⇒cos(α+β)=cos90(∵cos0=0)⇒α+β=90⇒α=90−βsin(α−β)=sin(90−2β)=cos2β   (∵sin(90−θ)=cosθ)

Hence option(B) is the correct answer

Answer 2

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