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If any two chords be drawn through two p...

If any two chords be drawn through two points on the major axis of the ellipse `x^2/a^2+y^2/b^2=1` equidistant from the centre prove that `tan""alpha/2 tan""beta/2 tan""gamma/2=1` where `alpha,beta,gamma,delta` are the eccentricity angles of the extremities of the chord.

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