$4x^2\left[\right]x+9$
$\left(2m-9n\right)^2$
$-2\int\frac{x}{\left(x^2+2\right)}dx$
$\lim_{x\to0}\left(\frac{\cot\left(x\right)}{x^2-x}\right)$
$\frac{4}{5}\sqrt[8]{x^{\frac{6}{7}}}$
$\int e^{2x}\sqrt{1+e^x}dx$
$\frac{-1}{4}a>-1$
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