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Verified answer
1][576° = 576°/180° π radian = 3,2 π rad
2][
sin 210° = sin (180° + 30°) = -sin 30°
3][
(3,3)
r = √(3² + 3²)
r = 3√2
tan a = 3/3 = 1
a = 45°
Koordinat kutub = (r,a) = (3√2 , 45°)