$\frac{x^3-6}{x^4+6x^2+8}$
$\:\left(\:24:\:2\:\right)\::12\:.\:6$
$180\cdot6$
$14+16b-4-8b$
$\frac{dy}{dx}\left(\sin\left(\frac{kx}{3}\right)^3-3\sin\left(\frac{kx}{3}\right)\right)$
$\lim_{x\to4}\left(\frac{2x^2-7x-4}{x-4}\right)$
$\frac{-3}{4x}\ge9$
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