$\int\left(\frac{\left(x^2\right)}{\sqrt{x^6+81}}\right)dx$
$x\frac{dy}{dx}+y=\frac{7}{x}+9x$
$4x-\left\{3y+\left[4x-\left(3y-4x\right)-3y\right]-4x\right\}-3y$
$\sin\left(-180\right)$
$\left(-b^n\right)\left(-3bc\right)$
$\int\left(\frac{1+2e^x}{1-e^x}\right)dx$
$9m-18n$
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