olymmath

Putnam 1942 A4

  • Session A

Find the orthogonal trajectories of the family of conics (x+2y)2=a(x+y)(x+2y)^{2} = a(x+y) . At what angle do the curves of one family cut the curves of the other family at the origin?

Dataset text AI-MO AoPS. Quoted with source.

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