$xy\left(x+2y\right)-2xy^2$
$\frac{4x+2}{x}$
$8\sin\:\left(x\right)=2+\frac{4}{\csc\:\left(x\right)}$
$\left(x-250\right)^2$
$\int4x^{-\frac{3}{2}}dx$
$5x-3y-z=1$
$\lim_{x\to-\infty}\left(\frac{1}{2x+1}\right)$
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