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सिद्ध कीजिए कि: |(sin 20^(@) , cos ...

सिद्ध कीजिए कि:
`|(sin 20^(@) , cos 20^(@)),(sin 70^(@) cos 70^(@))|=-sin 50^(@)`

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

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

sin 70^@ - cos 40^(@) =

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

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

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

The value of (sin 20^(@) cos 70^(@)+sin70^(@) cos 20^(@) ) is ……….. .

sin 10^(@) + sin 20^(@) + sin 40^(@) + sin 50^(@) - sin 70^(@) - sin 80^(@) =

cos70^(@)+sin40^(@)=