$\int\frac{2x-1}{\left(x+1\right)\left(x-2\right)}dx$
$\left(3x+4y\right)^3$
$x^2-5x^{+6}$
$4x^2+6\le0$
$5r-5=-165$
$a^2+ab^2$
$\lim_{x\to0}\left(e^{2x}-4x\right)^{\frac{1}{x}}$
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