10. If A = 60° and B 30°, prove that:
• (i) sin (A + B) = sin A cos B + cos A sin B.
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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
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