Add complete-square

[soegaard]

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.