If \( A, B, C \) are angles of a triangle, prove that \( \cos \frac{A+B}{2}=\sin \frac{C}{2} \)
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If \( A, B, C \) are angles of a triangle, prove that \( \cos \frac{A+B}{2}=\sin \frac{C}{2} \)https://bit.ly/YTAI_PWAP https://www.pw.live
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