$\lim_{x\to3}\left(\frac{4}{x-3}\right)$
$\frac{3z^9}{z^9}$
$2m+-4m$
$-3x+2a+\left(x-a\right)-\left(2x+a\right)$
$\log\left(3x-4\right)-log\left(2x+1\right)=log\left(2x-1\right)-log\left(3x+4\right)$
$4-2.-5-11-1$
$\int\frac{1}{a^2+b^2-2ab\cos\left(x\right)}dx$
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