$\lim_{x\to-2\:}\left(\frac{5x}{4-x^2}\right)$
$\lim_{x\to0}x\cdot ln2x$
$\frac{5x^2+16x+13}{x+2}$
$40-\left(-2-1\right)$
$8x^2y+7x^2y-2x^2y\:$
$\left(y-\frac{11}{3}\right)^2$
$\frac{2a^5+a^3+5a-8}{a+1}$
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