$y'=2\cdot\frac{y}{x}$
$1.25\cdot\frac{6}{18}$
$2xydx+\left(x^2-y\right)dy=0$
$\lim_{x\to\infty}\left(2\sqrt{x}-\sqrt{x-2}\right)$
$1+\frac{1}{sec^2x}=1$
$\int\left(\frac{x+1}{\sqrt{x^2+4}}\right)dx$
$\int_0^{1+i}\left(z^2\right)dz$
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