$\left(9a-b\right)\left(9a+b\right)$
$2x^2-\:5x^3-11x^2+20x+12$
$\frac{-3x^4+2x^3-7x}{x-2}$
$\frac{x}{5\:}-\:\frac{2x}{15}\ge\frac{x+4}{3}$
$\left(a-b\right)\left(3a^2+b^2\right)$
$\ln\left(7x\right)+\ln\left(x\right)$
$\int x^2\frac{1}{\sqrt{x^2-1}}dx$
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