$9k^4\:+\:36k^2\:+\:36$
$\int\left(\cos\left(\sqrt{7}\right)\right)dx$
$\lim_{x,y\to0,0}\left(\frac{1-\cos\left(x\right)}{xy}\right)$
$\lim_{x\to+\infty}\left(2x-6\right)$
$\frac{\sqrt{6\sec^2-36}}{6\sec\left(x\right)}$
$-6ab-5-ab-ab$
$4\cos^2-2\cos$
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