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

X(1), X(38), X(75), X(240), X(256), X(291), X(1580), X(1581), X(1582), X(1967), X(2227), X(3223),

vertices of the cevian triangle of X(1967)

Geometric properties :

K990 is the barycentric products X(1) x K322, X(6) x K995, X(75) x K787.

Its isogonal transform is K989 and its isotomic transform is K992.

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