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r = 4
θ° = 60°
Maka :
x = r.cos θ° y = r.sin θ°
x = 4.cos 60° y = 4.sin 60°
x = 4.1/2 y = 4.1/2√3
x = 2 y = 2√3
Jadi koordinat kartesius dari titik P(4,60°) adalah titik P = (2,2√3)