Question
शांकव ${x^2} - 4{y^2} = 1$ की उत्केन्द्रता है
$\therefore {b^2} = {a^2}({e^2} - 1)$
$⇒$ $\frac{1}{4} + 1 = {e^2}$
$⇒$ $e = \frac{{\sqrt 5 }}{2}$.
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