$\lim_{x\to0}\left(\frac{2\left(4^x-5^x\right)}{x}\right)$
$\frac{4m^2n^{-1}}{4n^4}$
$3x^4\cdot\left(x^2\right)^3$
$9\left(-3+15\right)$
$\frac{x^4+4x^3-4x^2-5}{x-2}$
$\int\cot\left(d\right)$
$6^{12}\cdot3^{12}$
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