Question

(sin54cos36+cos54sin36)ctg(-60)

Answer 1

(sin54cos36+cos54sin36)ctg(-60)=sin(54+36)*ctg(-60)=sin90*(-ctg60)=-(sqrt(3))/3

Answer 2

(sin54cos36+cos54sin36)ctg(-60)= sin (54+36)*(-^3/3)= sin(90) *(-^3/3)=-^3/3