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

For the hyperbola `x^2/ cos^2 alpha - y^2 /sin^2 alpha = 1;(0 lt alphalt pi/4)`. Which of the following remains constant when alpha varies?

A

abscissae of vartices

B

abscissae of foci

C

eccentricity

D

directrices

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The correct Answer is:
B
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