Tolong dibantu no.29:v. Makasih.

(8, 5π/6) = (8, 150°) = (r, a)
x = r cos a = 8 cos 150° = 8 . -1/2 √3 = -4√3
y = r sin a = 8 sin 150° = 8 . 1/2 = 4
Koordinat kartesius = (-4√3, 4)