$\int\frac{4x}{\sqrt{81+x^2}}dx$
$\frac{1}{8}+\frac{7}{8}$
$x^2+x^2\ln\left(x\right)$
$25a^{12}-81a^2b^4c^6$
$-y^4-1+2y^2$
$\left(10m^3\right)^{-2}$
$\frac{-24x}{x^2}$
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