$\int\frac{x^2-x-4}{\left(x+4\right)\left(x-2\right)}dx$
$13x^2z+2x^2z-x^2z-20x^2z$
$25x-5x^4$
$\int\frac{\left(x\right)}{\left(x^4+2x^2+2\right)}dx$
$\int8t\cdot e^{-0.2t^2}dt$
$18+5x+2x+4$
$\left(7-3x\right)\left(6+3x\right)$
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