$2x^3-6x$
$x^2-1+2^3$
$7\cdot8\cdot8\cdot8$
$28-2m;\:m=7$
$\frac{2x^2+x+1}{x-1}$
$\lim_{x\to\infty}\left(\frac{cos6}{x}\right)^{\left(x^2\right)}$
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