Question

If
$x = 9 + 4 \sqrt{5 \: } \: and \: xy = 1 \: then \: find \: the \: value \: of \: \frac{1}{ {x}^{2} } \: and \: \frac{1 {y}^{2} }{?}$
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Answer 1

Answer:

answer for the given problem is given