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

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

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Prove that : sin70^@ cos 10^@- cos70^@ sin 10^@= sqrt3/2 .

Prove that (sin70^(@)-cos40^(@))/(cos50^(@)-sin20^(@)) = 1/(sqrt(3)) .

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^(@))=

sin20^(@)*cos40^(@)+cos20^(@)*sin40^(@)=(sqrt(3))/(2)

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

Evaluate : sin50^(@)cos40^(@)+cos40^(@)+cos50^(@)sin40^(@)