If $x = 9$ is the chord of contact of the hyperbola ${x^2} - {y^2} = 9$, then the equation of the corresponding pair of tangents is
If $x = 9$ is the chord of contact of the hyperbola ${x^2} - {y^2} = 9$, then the equation of the corresponding pair of tangents is
- [IIT 1999]
- A
$9{x^2} - 8{y^2} + 18x - 9 = 0$
- B
$9{x^2} - 8{y^2} - 18x + 9 = 0$
- C
$9{x^2} - 8{y^2} - 18x - 9 = 0$
- D
$9{x^2} - 8{y^2} + 18x + 9 = 0$
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- [IIT 2004]
Find the coordinates of the foci, the vertices, the length of major axis, the minor axis, the eccentricity and the length of the latus rectum of the ellipse $\frac{x^{2}}{4}+\frac{y^2} {25}=1$.
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