Polar coordinates: \((r,\theta)\)
\(r=3,\theta= \frac{3\pi}{2}\)
Rectangular coordinates: \((x,y)=(r \cos{\theta},r \sin{\theta})\)
\(x=r \cos{\theta}=3 \cos{ \frac{3\pi}{2} }=3 \times 0=0
\\ y=r \sin{\theta}=3 \sin{ \frac{3\pi}{2} }=3 \times (-1)=-3\)
Rectangular coordinates are (0,-3).