$2\cos\left(x\right)+\sqrt{3}cos\left(x\right)=0$
$\frac{\left(x^2-6x-8\right)}{x-4}$
$\int x^2sen^{-1}\left(2x\right)dx$
$\frac{6}{12}pq-\frac{1}{2}pq$
$\frac{x^2-25}{x^2+3x-10}$
$2x-y=3$
$1519+31$
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