$\frac{5x^3-3x^2+x}{x-5}$
$81x^9-169xy^8$
$\frac{d^2}{dx^2}\left(\frac{1-2t}{3+t}\right)$
$\lim_{x\to0}\left(x^2-64sin3x\right)$
$\lim\:_{x\to\:1\:}\:\frac{x-1}{x^2+2x+3}$
$3\left(1\right)^3+1$
$36x^2+12x+10$
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