JEE Main · 2007 · 29 Apr 2007 · Offline · Hyperbola

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For the hyperbola , which of the following remains constant when varies?
  1. (A)eccentricity
  2. (B)directrix
  3. (C)abscissae of vertices
  4. (D)abscissae of foci✓ Correct

Answer: (D)

Solution

For this hyperbola and . The relation gives , so . The foci lie at , so the abscissae of the foci stay fixed at however varies.

JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option

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