$81-y^2$
$\frac{dy}{dx}+\left(\frac{2}{x}\right)y=x^{-4}$
$\frac{dr}{d\theta\:}+rtan\theta\:=8sec\left(\theta\:\right)$
$\int\frac{\left(2xin\left(x^2+1\right)\right)}{x^2+1}dx$
$\left(7m-8n\right)^2$
$86.978'92+6.879+95$
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