Expand:
${(y + \frac{1}{y})}^{2}$

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Solution

${(y + \frac{1}{y})}^{2}$
$= y^{2} + \frac{1}{y^{2}} + 2 \times y \times \frac{1}{y}$
$= y^{2} + \frac{1}{y^{2}} + 2$

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