$\left(r+9s\right)^2$
$\left(3a^3+4n\right)^2$
$\int_{-\infty}^0\left(\frac{1}{4x-10}\right)dx$
$-3x^2ym+6ymx^2+1mx^2y-4m$
$x^2-3x-72$
$\cos^2\left(\cot^2+1\right)$
$\frac{x-2}{x^2-4x}$
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