If and , then prove that A-B 2 =…

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

If sin⁡A=sin⁡B\sin A = \sin B and cos⁡A=cos⁡B\cos A = \cos B , then prove that sin⁡A−B2=0.\text{prove that } \sin \frac{A-B}{2} = 0.

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