$4x^2-8x=8$
$\int\frac{x-9}{x^2+81}dx$
$4^58^2$
$x^2-8x+15\le\:0$
$\frac{3x^4+19x^3+22x^2-6x+4}{x-2}$
$2y^23x$
$4\cdot\text{sen}\left(\theta\right)\cdot\text{cos}\left(\theta\right)=2\cdot\text{sen}\left(\theta\right)$
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