$2\cos\left(x\right)+2$
$16a^4b^5-20a^3b^2-24a^2b^6$
$\frac{24a^2b^2}{6ab^2}$
$\frac{6x^3+3x-2}{3x+6}$
$\frac{\left(sin^2\left(\frac{\pi\:\:}{2}-x\right)\right)}{1-sinx}-1$
$\frac{-18x^4y^3}{27xy^5z}$
$\lim_{x\to\infty}\left(\frac{\sqrt{1-x^2}}{36x^2-1}\right)$
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