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[" 5% "(sin70^(@)+cos40^(@))/(cos70^(@)+...

[" 5% "(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=(lim_(a)((a)/(1-1)))/(a)(1)/(a)pi sin],[[" (a) "1," (b) "1/sqrt(3)],[" (c) "sqrt(3)," (d) "1/2]]

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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^(@)) =

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

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

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

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

cos20^(@)cos40^(@)-sin5^(@)sin25^(@)=

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1