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Currently there isn't a way to enter that equation exactly as that. For plotting eclipses I would recommend converting it to a polar equation and use that instead.

We do however have plans to include that feature in a future version. Therefore you should be able to type that equation exactly as it in perhaps version 3.0. I will post another msg here when that feature is available.

is it possible to draw the following elipse in 2d:

3x^2+2xy+3y^2-2=0, if so how??

cheers