$\lim_{x\to1}\left(\frac{xlinx}{x^2-1}\right)$
$-6y+1-x^3-3x^3+1+2y-3x^3$
$\lim_{x\to0}x^2-4x+3$
$435\:-\:\left(-200\right)$
$13y-23-4$
$\left(-9x+5\right)\left(-9x-5\right)$
$\frac{x^3-x^2+x+1}{x^2-1}$
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