Solve for r, θ
r=\frac{3}{2}=1.5\text{, }\theta =2\pi n_{1}+\frac{\pi }{3}\text{, }n_{1}\in \mathrm{Z}
r=\frac{3}{2}=1.5\text{, }\theta =2\pi n_{2}+\frac{5\pi }{3}\text{, }n_{2}\in \mathrm{Z}
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