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[{:(sin 20^(@),-cos 20^(@)),(sin 70^(@),...

`[{:(sin 20^(@),-cos 20^(@)),(sin 70^(@), cos 70^(@)):}]=`?

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

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

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

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

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

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

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

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))

|["cos"70^(@), "sin"20^(@)], ["sin"70^(@), "cos"20^(@)]|=?