$\lim_{x\to\infty}\left(-\frac{x-x^2}{5}\right)$
$n^2-18n-81$
$\lim_{x\to0}\left(\frac{\sin\left(3x\right)\left(e^x+5\right)}{x}\right)$
$6\left(7x+8\right)+3x-6$
$\frac{d}{dx}\:\left(-12x^9\right)$
$2x^4-3x^2+3x-2$
$\frac{1}{2}\:.\:6x+2$
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