$12\cdot3^0\cdot3^{-4}$
$\int\frac{1}{\sqrt{x^4+8x^2+16}}dx$
$\frac{2x-9}{10}$
$9x^2-42x\:-21$
$xy^2-x^3y$
$6a^2+22a+20$
$\lim_{x\to\infty}\left(1+\frac{1}{x}\right)^{\left(x+2\right)}$
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