$25z^2+30z+9$
$\left(2a-3b-5c\right)^2$
$\int-9^{-2x}dx$
$\int x\cdot\sqrt{3x+1}$
$\left(x-y+1\right)\left(x^2+2xy+y^2+x+y+1\right)$
$\left(x-x^3\right)^3$
$\int x^5\left(x^2-3\right)dx$
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