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सिद्ध कीजिए : (i) sin 42^(@)cos 48^(...

सिद्ध कीजिए :
(i) `sin 42^(@)cos 48^(@) + sin 48^(@) cos 42^(@) =1`
(ii) ` cos 70^(@) cos 20^(@) - sin 70^(@) sin 20^(@) =0`

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Prove that : (i) sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1 (ii) cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0

Prove that : (i) sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1 (ii) cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0

cos 48^@ - sin 42 ^@ = ?

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Evaluate cos 48^(@) cos 42^(@) - sin48^(@) sin 42^(@)

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sin 70^(@)cos 10^(@) - cos 70^(@) sin 10^(@) = _________

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(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@))=