Question

if cos(A+B)=0 then sin(A+B)=

Answer 1

cos(α+β)=0

⇒cos(α+β)=cos90(∵cos0=0)

⇒α+β=90

⇒α=90−β

sin(α−β)

=sin(90−2β)=cos2β (∵sin(90−θ)=cosθ)

Answer 2

Step-by-step explanation:

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