Question Number 89925 by john santu last updated on 20/Apr/20
$${x}^{\mathrm{2}} \left({yy}''−{y}^{\mathrm{2}} \right)+{xyy}'\:=\:{y}\sqrt{{x}^{\mathrm{2}} \left({y}'\right)^{\mathrm{2}} +{y}^{\mathrm{2}} }\: \\ $$
x-2-yy-y-2-xyy-y-x-2-y-2-y-2-