Proof 1, that the angle bisector of angle <NboGNbi
and one of the axes of the Steiner circumellipse are identical:
Hyperlinks:
1.) https://napoleon-triangles.jimdofree.com/proof/
2.) https://mccay-circles.jimdofree.com/proofs/
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Proof 2, that the original triangle after the affine transformation
and the inner Napoleon triangle are homothetic:
