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I've graphed two polar curves and would like to shade the region inside one and outside the other. When I select the two equations and then select Integrate from the Equation menu, I get the error message

Cannot integrate the difference between the selected graphs.

It seems simple. Why can't Grapher do it?

In case it makes a difference, the two equations are r = 6 (a circle) and r = 6 - 6 sin(theta) (a cardioid). I want to shade the region inside the cardioid but outside the circle.

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Grapher can do it. Using the conjunction r > 6 & r < 6 - 6 sin (theta), we get the following

enter image description here

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