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The radius of the director circle of the hyperbola x^2/4 - y^2/3 = 1 is ................

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The radius of the director circle of the hyperbola x2/4 - y2/3 = 1 is ................

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The director circle of the hyperbola x2/a2 - y2/b2  = 1 is x2 + y2 = a2 - b2

 x2 + y2 = a2 - b2

⇒ x2 + y2 = 4 - 3 = 1

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