$\int\left(-\frac{21x^2}{\left(9-7x^3\right)^2}\right)dx$
$130+20\cdot10^2$
$8^{-1}\cdot8^{-5}\cdot8^3$
$\frac{dy}{dt}=\left(1+2t\right)\left(1+y\right)$
$\int x^2cos\left(\frac{x}{5}\right)dx$
$\int\frac{1}{x\left(9+x\right)}dx$
$2x^4y-x^2y+x=2$
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