$\lim_{x\to0}\left(\frac{x^4-81}{x-3}\right)$
$\log\left(x^2-3x+3\right)=0$
$\int_e^{2x}dx$
$-\left(-2\right)^5$
$6x-8\left(9x-8\right)$
$a\left(3\right)-2a^2+4a-8$
$\frac{1}{\left(x-3\right)\left(x+1\right)}$
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