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x = 2,5 . cos (360° - 60°)
x = 2,5 . cos 60°
x = 2,5 . 1/2
x = 1,25
y = r sin 300°
y = 2,5 . sin (360° - 60°)
y = 2,5 . (- sin 60°)
y = 2,5 . (-1/2√3)
y = -1,25√3
Koordinat cartesius (1,25, -1,25√3)