Polar Charts are usually used when you need to show something in a radial mode, when points are distributed around the point of origin, and the value is determined by distance from this point and angle. These charts are quite popular in online games, medicine, ecology, etc.
There is a single-series chart for a function which is a modification of f(x) = 1.5*sin2(3x). We can see that y-axis range is from 0 to 1.8, x-axis is visible and holds the values from 0 to 360 degrees with 30 degrees interval. Ticks are enabled on y-axis with an interval of 0.3 and there is a grid enabled, what makes easier to watch the function values.