Question

${a}^{2} + \frac{1}{ {a}^{2} } = 18 \: a \: is \: not \: equa \: to \: 0$
find
$a - \frac{1}{a} \: and \: {a}^{3} - \frac{1}{ {a}^{3} }$

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Answer 1

Step-by-step explanation:

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