Which of the following is independent of \( \alpha \) in the P hype...

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Which of the following is independent of \( \alpha \) in the
P hyperbola \( \frac{x^{2}}{\cos ^{2} \alpha}-\frac{y^{2}}{\sin ^{2} \alpha}=1,(0\alpha\pi / 2) \) ?
(1) Eccentricity
(2) Abscissa of foci
(3) Directrix
(4) Vertex
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