$13\cdot12.5$
$\lim_{x\to0}\left(\frac{xe^x}{x^3}\right)$
$\left(0-6\right)^2-8$
$\frac{8+12}{4}-\frac{9+15}{8}$
$\int\frac{1}{sin^2\left(x\right)\sqrt[4]{cot\left(x\right)}}dx$
$\left(x+3\right)\left(x-3\right)+9>0$
$\lim_{x\to b}\left(\frac{\tan\left(x\right)-\tan\left(b\right)}{x-b}\right)$
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