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For the hyperbola x^2/(cos^2alpha)-y^2/(...

For the hyperbola `x^2/(cos^2alpha)-y^2/(sin^2alpha)=1` , which of the following remains constant when `alpha` varies ?

A

Directix

B

Abscissa of vertices

C

Abscissa of foci

D

Eccentricity

Text Solution

Verified by Experts

The correct Answer is:
C
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