सिद्ध करें कि \( \sin 48^{\circ} \cdot \sin 23^{\circ} \cdot \sec 42^{\circ} \cdot \sec 67^{\cir...
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सिद्ध करें कि \( \sin 48^{\circ} \cdot \sin 23^{\circ} \cdot \sec 42^{\circ} \cdot \sec 67^{\circ}=1 \).
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