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सिद्ध कीजिए की : sqrt3cos 23^(@) -sin 2...

सिद्ध कीजिए की ` : sqrt3cos 23^(@) -sin 23^(@) =2cos 53^(@) `
` (ii) ( sin (A-B) )/( cos A cos B ) +( sin (B-C) )/( cos B cos C )+ (sin (C-A) )/( cos C cos A ) =0`

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