$9-x^2+5$
$5a-a+8a-12a+4a$
$\left(z^5+7\right)^3$
$\left(x+1\right)\left(x+2\right)\left(x-3\right)-4x\left(x-1\right)$
$\int\frac{\left(x^2+6x+11\right)}{\left(x+2\right)}dx$
$x^2+3x-8=-2$
$\int\frac{cos\left(x\right)}{x^2}dx$
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