$6^2-51+2+-12^2-8+22$
$\frac{\left(x^2-x+2\right)}{x^2-1}$
$\left(a^{2}+3\right)\left(a^{2}-3\right)$
$\frac{25-\left(a\:+\:1\right)^2}{5+\left(a+1\right)}$
$9t^2-2t=0$
$3sec^2x-5secx-2=0$
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