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y= r sin a = 4
tan a = -1 (kuadran 2 karena x negatif y positif)
a= 90°+45°= 135°
x= r cos a = -4
r cos 135°= -4
r. -V2/2 = -4
r= 4V2
koordinat kutub: ( 4V2, 135° )