$\lim_{x\to\infty}\left(\frac{x-\sin\left(x\right)}{x-\tan\left(x\right)}\right)$
$\frac{12^2-1}{x^3-1}$
$9x^2-12x+6.$
$x^2-1=2x$
$y\left(x-4\right)+x-4$
$\frac{x^2-3x-8}{x^2-2x+1}$
$x^{3}+x^{2}-x+7|\frac{1}{x^{2}x+1}$
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