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Add complete-square
Add a variant of CompleteSquare.
Recover circle or ellipse equation from a genereal second degree polynomial in x and y.
https://www.maplesoft.com/support/help/maple/view.aspx?path=Student/Precalculus/CompleteSquare https://resources.wolframcloud.com/FunctionRepository/resources/CompleteSquare/
See also Nspire.