Inclined-node curves
a^2/x^2 + b^2/y^2 = 1
Point X moves on fixed circle c of radius a.
The tangent at X cuts the fixed line at Y.
The parallel to the tangent at X, at distance b from it, cuts the orthogonal to e at Y, at Z. As X moves, Z describes this locus.
Variable masters : c, e, y, b.
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