Question

if sin (theta + 30 degrees) = cos 40 degrees find theta

Answer 1

Answer:

answer for the given problem is given

Answer 2

Let theta(f) be a fake angle

since sin(90-theta(f))= cos(theta(f)) since

cos(theta(f))= cos(40)

So theta(f))=40degree

So sin(90-40)=sin(theta+30degree)

Cutting sin on both side

50 degree= theta +30 degree

theta=20 degree

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