$cos=0.45$
$\lim_{x\to0}\frac{e^x-10x}{x}$
$\left(n-3\right)\left(n^2-6n+9\right)$
$\frac{u^3}{u^8}$
$ab\left(5a^2-3a^4b+7b^2\right)$
$4m^3m$
$\left(1-x\right)\left(2-x\right)\left(-1-x\right)$
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