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As you may or may not be aware, there are multiple co-ordinate systems by which a graph may be defined. An ellipse graph has the general equation in the following systems:

Cartesian (what most people are used to): (X-H)^2 (Y-K)^2

---------- + ----------- = 1 (A,B,H,K are constants) A^2 B^2

Polar: r(θ)= sqrt( (bcos(θ))^2+(asin(θ))^2 )

Parametric: x = a cos(t) , y = b sin(t)

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Q: How do you do an ellipse graph?
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