$\lim_{x\to0}\left(\frac{tan\cdot x-x}{x^3}\right)$
$-9m-7m-13m$
$\left(a^{x-2}+5\right)^2$
$9\cdot9\cdot9$
$16=x^2+6x$
$x^3-11x$
$\frac{27x^3-64}{3x-4}$
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