Polar Functions 
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Polar functions are entered in terms of r and θ. Because there is no θ key on a computer keyboard, the graph tool uses th to represent θ.
You can enter a normal polar equation such as r = 5 sin 3θ by typing
r = 5 sin 3th
or
5 sin 3th
The r = is optional and will be assumed if you do not enter it.
the graph tool can also draw inverse Polar functions  just enter them in terms of r.
th = 3r
th = 1/r
th = pi/4
As shown above, the graph tool can draw polar grids. Go to the Grid page and check Polar Grid
Default Domains Cartesian and Inverse Cartesian functions have an "implied domain"  the bounds of the axes you have drawn the function on. If you have not explicitly set a domain, the graph tool can automatically determine a suitable domain from the axes it is using. For Polar graphs, there is not a natural domain that can be easily determined. To counter this problem, the graph tool uses some default domains for polar graphs.
Polar graphs 0 ≤ θ ≤ 360 (degrees mode) 0 ≤ θ ≤ 2π (radian mode)
In most cases these default domains produce acceptable results. Sometimes you may need to override the default domains in order to create the result you are after.
