$\left(3a-26\right)^2$
$\left(-5x-11y\right)\left(5x-11y\right)$
$\frac{5^n-1^n}{5-1}$
$4x^2\:-12x-16y+41\:=\:0$
$\left(7y^2-1\right)\left(7y^2+2\right)$
$\left(+2\right)\cdot\left(+4\right)+\left(+2\right)\cdot\left(+8\right)$
$\frac{x^2+2}{x^2+3}$
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