$\int x^3\sqrt{9x^2+1}dx$
$-450+27$
$5gm^2\left(2g^2m-gm^3+4g^2m^2\right)$
$\frac{1}{x+4}-\frac{1}{6}=\frac{1}{x+1}$
$\int\left(\frac{x-4}{x^2+x-2}\right)dx$
$\int x\left(150e^{-150x}\right)dx$
$x\left(x^2+1\right)-2\left(x+1\right)$
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