√ 3 cos a-2 cos(a-π/6)

Question

√ 3 cos a-2 cos(a-π/6)

Answer 1

√3cos a- 2 cos(a-π/6)= √3 cosa -2cosa*cos (π/6)+sina*sin(π/6)=
 √3 cosa -2cosa*√3/2 +sina*1/2 =√3cosa -√3cosa+1/2 sina=1/2 sina
Ответ:1/2 sina