$\left(1-\cos\left(6x\right)\right)$
$x^2-19x-66$
$\lim_{x\to0}\left(\frac{x-\arccot\left(x\right)}{x^3}\right)$
$x+\left(x\cdot0.19\right)$
$4''-y=1$
$x^2-8+1$
$9x^2-12x+7$
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