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α = 240 derajat
x = r Cos α
= 4√3 . Cos 240
= 4√3 . 1/2
= 2√3
y = r Sin α
= 4√3 . Sin 240
= 4√3 . 1/2√3
= 6
jadi, koordinat cartesiusnya yaitu (2√3,6)