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

For the hyperbola `(x^2)/(cos^2alpha)-(y^2)/(sin^2alpha)=1` , which of the following remains constant when `alpha` varies? (1) eccentricity (2) directrix (3) abscissae of vertices (4) abscissae of foci

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