$6x^2-19x-7$
$3\cos x-1=0$
$\lim_{x\to0}\left(\frac{1}{4\left(2x+3\right)^3}\right)$
$\sqrt{3x-2=-4}$
$-9\:x\:8$
$81x^3+81x^2-72x-72$
$f\left(x\right)=x^3-9x^22+20x-12$
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