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The normla to the hyperbola (x^2)/(a^2)-...

The normla to the hyperbola `(x^2)/(a^2)-(y^2)/(b^2)=1` drawn at an extremity of its latus rectum is parallel to an asymptote. Show that the eccentricity is equal to the square root of `(1+sqrt(5))//2.`

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MOTION-HYPERBOLA-EXERCISE-3
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