A point \( O \) is the centre of a circle circumscribed about a tri... VIDEO
A point \( O \) is the centre of a circle circumscribed about a triangle \( A B C \). Then \( \overrightarrow{O A} \sin 2 A+\overrightarrow{O B} \sin 2 B \)https://bit.ly/YTAI_PWAP https://www.pw.live
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