Question
दीर्घवृत्त $9{x^2} + 25{y^2} = 225$ की उत्क्रेन्द्रता है
$\therefore e = \sqrt {1 - \frac{{{b^2}}}{{{a^2}}}} $
$= \sqrt {1 - \frac{9}{{25}}} = \frac{4}{5}$.
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