$\lim_{x\to4}\left(x+2\right)\sin\left(\frac{1}{x-4}\right)$
$-x^3-x^3$
$4m^2-6\cdot m^3+2m^2-7$
$\left(-3ab-5x^3\right)^2$
$3\left(2-2-2\right)$
$4x^4+144x^2$
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