Вычислите cos(-30°) sin660° ctg(-510)°

Question

Вычислите cos(-30°) sin660° ctg(-510)°

Answer 1

=- Cos30°Sin(720° - 60°)Ctg(540° -30°)=
= - Cos30°Sin60°Ctg30° = -√3/2·√3/2·√3= -3√3/4