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

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

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

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

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

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

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

sin 10^(@)+sin 20^(@) + sin 40 ^(@) + sin 50 = A) sin 15^(@) +sin 75^(@) B) cos 15^(@) + cos75^(@) C) sin 70^(@) + sin 80^(@) D) cos 70^(@) + cos 80^(@)

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

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