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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

abscissae of vertices

B

abscissae of foci

C

eccentricity

D

directrix

Text Solution

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The correct Answer is:
B
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