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t + cos(t * 1.5) * 0.2
And, in fact, now that I count the knots drawn on the diagram, it's not showing the one at 342 degrees, even though it is shown in the list. I tried adding another knot there and it shot off into space somewhere on the other side of the diagram. Maybe an off-by-one error somewhere in the handling of that list?
Also, I can't copy-paste into the function box. I want to be able to do that because I'm thinking in terms of the right-hand graph and entering a function for the left-hand graph, so I ask wolfram alpha to integrate my function and then try to paste that in there... but no such luck.
While I'm talking about it, is a planetary pinion planned at any point? Initially I thought I was going to get by with the elliptical gear solution, which does have that option, but I'm now realising I have a more complicated problem with clearances and axle radius. I need a planetary gear arrangement and if my reasoning is correct I might also need to figure out how to arrange a non-integer pinion order (something like 1.1; turning from -200 to +200 degrees).