$\lim_{x\to\infty}\left(\frac{1}{3^n}\right)$
$y'+y=e^{\left(-x\right)}\:+\:x$
$2\sin\left(\frac{x}{2}\right)-1=0$
$\lim_{x\to\infty}\left(\sqrt[3]{x^3+3x^2}\right)-x$
$\frac{-x^4+6x^2-4x+15}{x+3}$
$\left(3x^2-10y^3\right)\left(3x^2+10y^3\right)$
$m^2-18m+3$
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