$\int x^2e^{13x}dx$
$x\frac{4}{3}x-3$
$cos\left(x-y\right)=1$
$\frac{x^2-\left(y+2\right)}{xy-y^2-2y}^2$
$\left(-81\right)\cdot\left(-81\right)\cdot\left(-81\right)\cdot\left(-81\right)$
$x\left(y^2\right)dx+\left(1-x\right)dy=0$
$\frac{2x-x^2-x^3}{x^3-3x+2}$
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