tolong jelaskan no 3,4,5 terimakasih :')

hitung sorangan :v :v :v :v

3) cos x = -1/2 => di kuadran 2 dan 3 dengan x = 60°
Kuadran 2 = (180° - 60°) = 120°
Kuadran 3 = (180° + 60°) = 240°

4) Tan x = -1 => dikuadran 2 dan 4 dengan x = 45°
Kuadran 2 = (180° - 45°) = 135°
Kuadran 4 = (360° - 45°) = 315°

5) sin x = -1/2 => dikuadran 3 dan 4 dengan x = 30°
Kuadran 3 = 180° + 30° = 210° = (210°/180°)π = (7/6)π = 1 1/6 π
Kuadran 4 = 360° - 30° = 330° = (330°/180°)π = (11/6)π = 1 5/6 π