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

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

A

eccentricity

B

directrix

C

abscissae of vertices

D

abscissae of foci

Text Solution

Verified by Experts

The correct Answer is:
D
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