Yes, I see it, @MELGAR. I guess I was thinking that every point of the easement was in fact a curve however slight, but you are saying because it starts from a tangent, it can't be a spiral. That makes sense. But it makes me curious. Is an "easement" strictly a practical term used in the physical world, or does it have a use ( or even exist) in pure mathematics? Your formula seems to imply a mathematical model.
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