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Hullo everyone!

Hows it going?

I am confused with how to interpret the graph of r = cos(theta) in polar coordinates.

I tried graphing it manually. and this is how I interpreted it:

r(0) = cos(0) = 1

r(pi/2) = 0

r(-pi) = -1

r(3pi/2) = 0

r(2pi) = 1

This gives me three points in a line @.@ with one on the negative x axis, one on the origin, and one on the positive x axis. But apparently, its supposed to be a circle; how so?

Could someone please explain where I am going wrong?

Thanks v. much!

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# R = cos(theta) in polar coordinates?

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