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सिद्ध करें कि cos 48°. cos 23°. cosec 42°. cosec 67° = 1.

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सिद्ध करें कि cos 48°. cos 23°. cosec 42°. cosec 67° = 1.

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L.H.S. = cos 48°. cos 23°. cosec (90° - 48°). cosec (90° - 23°)

\(=\frac{1}{\sec 48^{\circ}} \cdot \frac{1}{\sec 23^{\circ}} \cdot \sec 48^{\circ} \cdot \sec 23^{\circ}=1=\text { R.H.S. Proved. }\)

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