Multiple choice question II — task. Mathematics State Board, Class 10.

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y^{2} + \frac{1}{y^{2}}

is not equal to

${(y + \frac{1}{y})}^{2}$
${(y + \frac{1}{y})}^{2} - 2$
${(y - \frac{1}{y})}^{2} + 2$
$\frac{y^{4} + 1}{y^{2}}$

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