Question

Найти значение выражения sin330° - cos240°

Answer 1

sin330° - cos240° = sin(-30°) - cos(-120°) = -sin30° - cos120° = -0.5 - (-0.5) = 0

Answer 2

Ответ:
sin330° - cos240°=sin(270+60)-cos(270-30)=-cos60+sin30=-1/2+1/2=0