$b2\:+\:18b\:+81$
$\frac{dy}{dx}=\frac{x^2+5}{2y-1}$
$\left(1+2i\right)^4$
$\int\frac{\csc\left(\frac{3}{x}\right)}{x^2}dx$
$y'\:=\:\frac{3y^2-x^2}{xy}$
$3x^2+2x^2-x^2-x$
$60x-x^2=0$
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