$\int zcos3z\:dz$
$\frac{9c^2}{16}-\frac{42c}{32}+\frac{49}{64}$
$tan37=\frac{y}{7}$
$-3\left(x+4\right)=5x+20$
$\frac{1+senu}{cosu}=\frac{cosu}{1-senu}$
$\lim_{x\to1}\frac{1-x}{\left(x-1\right)lnx}$
$\lim_{x\to0}\left(\frac{\ln\left(3-x\right)}{x^2-4}\right)$
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