$\left(\sqrt{x}+4\right)\left(\sqrt{x}-4\right)$
$-6ab-5-ab-ab$
$\left(x+2\right)y'=1$
$\frac{\left(1-\cos\left(v\right)\right)\left(1+\cos\left(v\right)\right)}{\cos^2\left(v\right)}=\tan^2\left(v\right)$
$\lim_{x\to0}\left(\frac{\ln\left(x\right)}{2x^{-1}}\right)$
$\left(9z\right)^{-4}$
$\frac{\cos\theta}{\sin\theta+1}$
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