Hello, How to plot a function [contours, or density] say in 2D, but that is expressed in polar coordinates (r and phi) and not cartesian coordinates which are taken automatically by the notebook? Example
f = r^2 Cos [phi], {r,-5,5}, {phi,0, 2 Pi}
When I do that, the notebook automatically assumes r and phi to be the cartesian coordinates x and y!
