$\frac{40}{20}$
$3xy^2z^2-6xy^2z^2$
$3x^3-x^2y+5xy=y-3x$
$\frac{\left(x^2+4x+100\right)}{x-1}$
$\frac{1-sin^2x}{cot^2x}=1-cos^2x$
$\left(5x-4\right)^2\left(5x+4\right)^2$
$\int\frac{x-2}{\left(x+2\right)\left(x-4\right)}dx$
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