Images X1 X2

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X1 x2. (X^2-Y^2)/(1-X^2). Y=X^2+1/X^2-1. Y=x2+2x-1. Y2-y1/x2-x1.
(X^2-Y^2)/(1-X^2). Y=X^2+1/X^2-1. Y=x2+2x-1. Y2-y1/x2-x1.

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