$a2-9$
$\left(y+6m\right)\left(y-6m\right)$
$\left(5x^2+4\right)\left(5x^2+4\right)$
$4x^2-7x+5$
$8\cdot\frac{1}{4}$
$\left(\frac{b^7}{b^4}\right)^2$
$\frac{x^{2}}{x^{2}}=\frac{3}{x}$
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