चतुर्भुज \( A B C D \) में सिद्ध कीजिए कि- \[ \sin (A+B)+\sin (C+D)=0 \]

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चतुर्भुज \( A B C D \) में सिद्ध कीजिए कि-
\[
\sin (A+B)+\sin (C+D)=0
\]
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