$6x^2+13x-8$
$3.3\cdot9$
$3-2+1+2-3+2+4-2$
$\left(x^2+2x+1\right)\left(x^2-4x+3\right)$
$\lim_{x\to2}\frac{x^2-8x+12}{x-2}$
$\sqrt{\frac{-16x^2}{-8x^{-2}}}$
$\int_{-1}^36\left(3x^2+2x+1\right)dx$
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