$\left(xy-4x^2zy\right)\left(xy+4x^2zy\right)$
$\frac{9x^2+5x-1}{x+1}$
$v^2-10v+25$
$5mn-3n^3;\:m=3;\:n=2$
$-199+-325$
$\lim_{x\to0}\left(\frac{3x^3-5x}{2x^2+1}\right)$
$\frac{x^5+12}{x^2+x+2}$
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