$\frac{x^3-7x^2+5x+1}{x-1}$
$4x\left(0.428-1mn\right)$
$ln\infty$
$\lim_{x\to\infty}\left(\frac{x^2-4}{x+4}\right)$
$\frac{\left(x^3-2x^2-3x-4\right)}{x^2+1}$
$\left(1\:+\:2x\right)^4$
$\left(2w^4\:z\:+\:4\:x^3y\right)\:\left(2w^4\:z\:-\:4\:x^3y\right)$
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