Polar Form of Complex Number/Examples/3 cis -2 pi 3^-1

Example of Polar Form of Complex Number
The complex number $\polar {3, -\dfrac {2 \pi} 3}$ can be expressed in Cartesian form as:
 * $3 \, \map \cis {-\dfrac {2 \pi} 3} = -\dfrac 3 2 - \dfrac {3 \sqrt 3} 2 i$

and depicted in the complex plane as:


 * 3 cis -2 pi 3^-1.png