Question

((sin 130 + cos 20)/ (cos 130 + cos 110))* корень из 3

Answer 1

((sin 130 + cos 20)/ (cos 130 + cos 110))* sqrt(3)=

(2cos30cos10)/(2cos120cos10)*sqrt(3)=cos30/cos120*sqrt(3)=cos30/(-sin30)*sqrt(3)=-ctg30*sqrt(3)=-sqrt(3)*sqrt(3)=-3