$\lim_{x\to9}\left(\frac{5\left(x-9\right)}{\left(x-9\right)^2}\right)$
$ycos\left(xy\right)dx+xcos\left(xy\right)dy=0$
$\lim_{x\to\infty}\left(\frac{\left(x^4ln^2cos\left(\frac{1}{x}\right)\right)}{x+1}\right)$
$4x^2\:+\:\:16x\:+\:49$
$\frac{2x+6}{2}-2x=3$
$\left(-75\right)\left(-120\right)\left(-1\right)$
$\lim_{x\to\infty}\frac{1}{\sqrt{x-1}}$
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