Question

8) Cop (90 - A) =0, then sim (A+B)​

Answer 1

Answer:

cos2β

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)

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