Let chords of the circle x2 y2 = a2 touch the hyperbola x2a2 y2b2 = 1. Then their middle points lie on the curve

SOLVED:Let A B be a diameter of a circle C, and let chords A D and B E (extended, if necessary) of C intersect at a point F . Prove that the circle D E F is orthogonal to the circle C.

ROAD TO TOP GLOBAL CLAUDE LET SOLO RG

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