$9r^2-4r+1$
$\left(\frac{x^2-3}{1+x^5}\right)^{\frac{1}{3}}$
$y=\left(\frac{1}{1+x^2}\right)dx$
$\left(-13p^3q^4\right).\left(-8p^7q^5r\right)\:$
$\frac{a^2+ab-ad-bd}{2a^2b+2a^2b}$
$7-x^2-\:x\:para\:x=-2$
$\lim_{x\to\infty}\left(\frac{x+e^{2x}}{1+e^{4x}}\right)$
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