Question

Найдите значение выражения
-4√3cos(-930)

Answer 1

$-4sqrt3, cos(-930^circ)=-4sqrt3, cos930^circ=-4sqrt3, cos(720^circ+120^circ)=\\=-4sqrt3, cos120^circ=-4sqrt3, cos(180^circ-60^circ)=-4sqrt3cdot (-cos60^circ)=\\=-4sqrt3cdot (-frac{1}{2})=2sqrt3$