$\left(n^2-n-1\right)\left(n^2+n-1\right)$
$\int\frac{t}{t^4-4}dt$
$\lim_{x\to1}\left(\frac{x^3-x^2+x-1}{x+\ln\left(x\right)-1}\right)$
$\lim_{x\to3}\left(\frac{4x-12}{x^2-4x+3}\right)$
$8-4x=x+13$
$xy-x+2y=3$
$\left(3x^2\:-\:2y\right)^3$
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