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x = r cos(α)
x = 4 cos(240)
x = 4 (-1/2)
x = -2
y = r sin(α)
y = 4 sin(240)
y = 4 (-1/2 √3)
y = -2√3
maka, koordinat kartesiusnya ( -2 , -2√3 ).
Jadikan sebagai solusi terbaik yaaaaaaa :D