$y=u^2+2u$
$\lim_{x\to\infty}\left(\frac{x}{x+12}\right)^x$
$\left(2x+5\right)\left(2x+6\right)$
$\frac{d}{dx}\left(\left(\arcsec\left(8x\right)\right)\right)\:\left(6x^{3\:}-3\right)$
$72x^2+36xy-27x$
$2xy+3x+4xy$
$\lim_{t\to1}\left(\frac{t\left(t-1\right)}{t-1}\right)$
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