$\left(\:a\:+\:20\:\right)\left(\:a\:+\:15\right)$
$r^{2\:}-5r$
$\lim_{x\to\infty}\left(\frac{1-\frac{sinx}{x}}{x^2}\right)$
$\left(xy+2z\right)^2$
$\left(3x^2+8y^2\right)dx+\left(16xy+15y^2\right)dy=0$
$\frac{-4m^2n^3}{16m^2n}$
$\int\frac{x^3}{\sqrt{16-x^2}}dx$
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