$\lim_{x\to-3}\left(\frac{x^2+4x+3}{x^2+5x+6}\right)$
$\left|-6\right|\cdot\left|-3\right|+\left|16\right|$
$12.55+18.25+5$
$\int\frac{8x^2}{x^4-1}dx$
$5m^2+7m+15$
$\int\frac{2x}{\left(x^2+5\right)^3}dx$
$4b^33a^4b^2$
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