$6z^2+z-2$
$-4-9+6+\infty$
$2\left(y^4-3\right)$
$1+50x+25x^2$
$\int_0^1xye^{x^2+y^2}dy$
$\int\left(x+a\right)\left(x+b\right)dx$
$\left(r^2+4r+3\right)$
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