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Q)

For the Hyperbola $\frac{x^2}{\cos^2 \alpha} - \frac{y^2}{\sin^2 \alpha} = 1$, which of the following remains constant when $\alpha$ varies?


( A ) Directrix
( B ) Eccentricity
( C ) Abscissae of vertices
( D ) Abscissae of foci

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