$\lim_{x\to2}\left(\frac{x^2-3}{x-2}\right)$
$64m^6+216n^9$
$\frac{z}{2}+5=3$
$y'=\frac{7y+6}{x^2}$
$\frac{3}{2}x-2,5=5+\frac{1}{4}x$
$\int\:\frac{e^t}{e^t+1}dt$
$\lim_{x\to0}\left(\frac{\cos\left(2x\right)-1}{\cos\left(x\right)}\right)$
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