Elliptical training machine

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Yesterday I was at the gym, and asked myself: does the elliptical training machine really trace an ellipse? The answer is: not exactly, and here's a visual proof.

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EvansCucakes
Equation C
Different Ways to Translate - Task
Varignon Tuval Avishai
y' = e^y (3x^2 – 6x) 2013 #6

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3D 向量（三維）
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Elliptical training machine

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