\( \triangle A B C \) में, सिद्ध कीजिए कि \( \frac{a^{2}-b^{2}}{2} \cdot \frac{\sin A \cdot \sin...
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\( \triangle A B C \) में, सिद्ध कीजिए कि \( \frac{a^{2}-b^{2}}{2} \cdot \frac{\sin A \cdot \sin B}{\sin (A-B)}=\Delta \).
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