$\frac{2\cos\left(x\right)}{\cos^2\left(x\right)-1}$
$\lim_{x\to\infty}\left(\left(e^{\left(\frac{1}{x}\right)-1}\right)lnx\right)$
$\int\left(2\sin x+6\cos x\right)dx$
$\lim_{x\to-4}\left(\frac{2x+1}{\left(x+4\right)^4}\right)$
$\left(3a^3+2\right)\left(3a^3-9\right)$
$\left(6x+2y\right)y\left(6x-2y\right)$
$2-1.66$
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