$\frac{4m^{-4}n^{-3}}{2mn}$
$b^5+5b^3$
$-7b\left(4b^2-9a^2-4ab\right)$
$4x^2+12x+9>0$
$\frac{\left(\frac{1}{16}a^3-\frac{5}{8}a^2b+\frac{5}{3}ab^2-b^3\right)}{\left(\frac{1}{4}a\frac{3}{2}b\right)}$
$2-\left(2+6\right)\left(5-8\right)$
$\lim_{x\to\infty}\left(\frac{e^x}{3+\cos\left(x\right)}\right)$
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