$\left(mn-8a\right)^2$
$\frac{c}{\frac{c}{0}}$
$4x+13^2$
$3x^3-4x+1.x+2$
$\:-x^2+4x-7=0$
$12x^2-96x+144$
$\frac{1}{2}\int\left(u^{-\frac{1}{2}}\right)du$
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