$3uv-6uv+v^2$
$\int\frac{x^2-2}{x^3+x}dx$
$4m^n^2\:+\:25h^2n^2\:+\:4m^2\:+\:25h^2$
$\frac{x^3+6x^2-4x+19}{x-3}$
$\lim_{x\to\infty}\left(\frac{\left(\frac{1}{\left(x+h\right)^2}-\frac{1}{x^2}\right)}{h}\right)$
$5\left(a+b\right)^2\cdot2\left(a+b\right)^3$
$r^2+r-2$
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