$\left(5-7\right)\cdot\left(-4+1\right)$
$\int\frac{x^3+1}{x^2\left(x-1\right)^2.\left(x^2+1\right)^2}dx$
$-x^2+8x+9$
$\sqrt{81}\cdot\sqrt{25}$
$\left(3z-1\right)\left(3z+1\right)$
$f\left(x\right)=\left(\frac{x}{1-x}\right)^2$
$x^2+12x+144$
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