If \( \mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D} \) are angles of a quadrilateral, then prov... VIDEO
If \( \mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D} \) are angles of a quadrilateral, then prove that \( \sin A+\sin (B+C+D)=0 \).https://bit.ly/YTAI_PWAP https://www.pw.live
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