Question

if A=60 and B = 39 verify that cos(a+b)= cos a cos b - sin a sin b

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Answer 1

Answer:

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Step-by-step explanation:

A = 60 and B = 30 Now, A + B = 60 + 30 = 90 Also, A – B = 60 – 30 = 30 sin (A + B) = sin 90 = 1 sin A cos B + cos A sin B = sin 60 cos 30 + cos 60 sin 30 Read more on Sarthaks.com - https://www.sarthaks.com/139537/if-a-60-and-b-30-verify-that-sin-a-b-sin-a-cos-b-cos-a-sin-b