$y=\log\left(2x-4\right)$
$\cos\left(u\right)+\tan\left(u\right)\sin\left(u\right)$
$\lim_{z\to0}\left(\frac{\sin\left(z\right)}{z}\right)^{\frac{1}{z^2}}$
$\int\frac{x^{2}-91}{x+9}dx$
$4x^2-6xy+6yx-9y^2$
$1,6^2-1,6$
$\frac{x^2+2x}{x+1}$
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