$\lim_{x\to0}\left(\left(\frac{1}{x}-cotx\right)\right)$
$\lim_{x\to+\infty}\left(1-\frac{4}{x}\right)^{6x}$
$\left(-y-5z\right)\left(6x+z\right)$
$10x^3+15x^2$
$2h^3\:-\:4h\:-\:2$
$5a^3b-3a^4b^2+7ab^3$
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