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[" For the hyperbola "(x^(2))/(cos^(2)al...

[" For the hyperbola "(x^(2))/(cos^(2)alpha)-(y^(2))/(sin^(2)alpha)=1," which of the following remains constant when "alpha" varies "],[[" (a) Abscissa of vertices "," (b) Abscissa of foci "," (c) Eccentricity "," (d) Directrix "],[" an a for the is a tangent to "4x^(2)-9y^(2)=1," then "]]

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