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a^2 (a^4 - b^2c^2) x (c^6 y^2 - b^6 z^2) = 0

X(2), X(6), X(31), X(32), X(237), X(699), X(1501), X(1691), X(1976), X(9468)

isogonal conjugates of the infinite points of the Steiner ellipse

vertices of the cevian triangle of X(1691)

See CL041 and K128.

K789 is the isogonal transform of K738 and the X(32)-isoconjugate of K128.

It is a cubic anharmonically equivalent to K020 as in Table 66.

Under the symbolic substitution SS{a -> a^2}, the image of K155 is K789.