JEE Math Practice Question
For the Hyperbola $${{{x^2}} \over {{{\cos }^2}\alpha }} - {{{y^2}} \over {{{\sin }^2}\alpha }} = 1$$ , which of the following remains constant when $$\alpha $$ varies$$=$$?
- A.abscissae of vertices
- B.abscissae of foci
- C.eccentricity
- D.directrix.
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