$\int\left(\frac{1}{\sqrt{81x^2+1}}\right)dx$
$k^m\cdot k^n$
$y=xy+3y-x-3$
$-6\cdot0.03$
$\frac{dy}{dx}=\frac{4}{x^2+4}$
$-b-10b$
$\lim_{x\to0}\left(\frac{cos\left(\frac{1}{x}\right)\left(cos\left(x\right)-1\right)}{x}\right)$
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