а)sin120° = sin(180° - 60°) = sin60° = √3/2
б)cos135° = cos(180° - 45°) = -cos45° = -√2/2
в)tg150° = tg(180° - 30°) = -tg30° = -√3/3
г)sin150° = sin(180° - 30°) = sin30° = 1/2
д)cos120° = cos(180° - 60°) = -cos60° = -1/2
е)tg135° = tg(180° - 45°) = -tg45° = -1