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equQ084

X(1), X(3), X(2635)*

excenters

extraversions of X(2635)*

vertices of the cevian triangle of O

Q084 is the isogonal transform of the stelloidal quartic Q083.

It follows that Q084 is a quintic meeting the circumcircle at A, B, C and at the vertices of a square.

A, B, C are nodes with tangents the bisectors of ABC.