$55gn^2n^3x+110m^2n^3x^2$
$12ab\:-\:9ac\:$
$-6^0$
$\left(x+\sqrt{2}y+z\right)^2$
$13.50+13.50$
$\int\frac{\left(5x+3\right)}{x^2+4}dx$
$\frac{1+cos^2x}{sen^2}=2csc^2x-1$
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