$\frac{\left(1-sinx\right)}{cos2x}=\frac{cos2x}{1+sin2x}$
$6x-16y-24x+4yz$
$\frac{2x-1}{x}<2$
$\left(-63\right)\left(+35\right)+\left(+28\right)+\left(-72\right)$
$\lim_{x\to-\infty}\left(\frac{\frac{\:1}{x\:}-\frac{1}{2}}{x-2\:}\right)$
$\lim_{x\to\infty}\left(\ln\left(x\right)^2\right)$
$\frac{d}{dx}\left(\frac{cosh\left(x\right)}{senh\left(x\right)}\right)$
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