Question

A) cos 120Б) sin 135В) cos 135Г) sin 120

Answer 1

Cos135°=cos(180°-45°)=-cos45°=-√2/2

Answer 2

A) cos 120 = -0.5

B) sin 135 = 1/√2 = 0.707

C) cos 135 = -1/√2 = -0.707

D) sin 120 = √3/2 = 0.866