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In the Cartesian grid, you can use the Point command to locate a point on a particular object.
I'd like to restrict a point in the polar grid to a particular theta, so the point slides along the line theta=pi/3, for example.
How can I do that? I can only seem to define the polar equation in terms of r...
The same question 
Angle Slider α then
Angle Slider α then
Yes. For some reason, I was limiting my thinking to polar forms only in the polar coordinate grid. But Cartesian forms are valid there, too! Thanks! I also added restrictions (x>=0 or x<=0).
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