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

For the hyperbola `(x^(2))/(cos^(2)alpha)-(y^(2))/(sin^(2)alpha)=1`, which of the following remains constant when `alpha` varies

A

Directrix

B

Abscissae of vertices

C

Abscissae of foci

D

Eccentricity.

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MODERN PUBLICATION-CONIC SECTIONS-EXERCISE
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  7. A focus of an ellipse Is that the rigin. The directrix is the line x=4...

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  8. Consider three points : P (- sin (beta- alpha), - cos beta), Q = (cos...

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  9. Consider two curves C1:y^2=4x ; C2=x^2+y^2-6x+1=0. Then,

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  20. If P and Q are the points of intersection of the circles x^(2)+y^(2)+3...

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