$4+-280$
$\int_0^{+\infty}\frac{1}{\left(x+1\right)^{\frac{3}{2}}}dx$
$\int\frac{x\left(x+1\right)}{\sqrt{x^2+4}}dx$
$\int_0^x-0.001dx$
$\left(x^2-4x-1\right)^2$
$2x^2+5x-7$
$121-x^2$
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