$x'+2y=e^t$
$\frac{x^2+x-6}{x-2}$
$4x^2-60x+221$
$ydy=\left(2x^2-1\right)dx$
$\int_{-2}^{-1}36xdx$
$1\tan+\tan0$
$\left(a+b^3\right)^3$
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