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I have differential equation $x\cdot\sqrt{4+y^2}\,dx + y\cdot\sqrt{1+x^2}\,dy = 0$, which is simple to solve on paper, but I have problem solving it with Maple (I use 10th, tried on 14th also). When applying dsolve it complains that it is not ODE. Any suggestions? Thank you in advance

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    @Fabian Could post as an answer. Because it is perfectly working solution. Thank you.2011-03-08

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The command you are looking for is

dsolve(x*sqrt(4+y(x)^2)+y(x)*sqrt(1+x^2)*diff(y(x),x), y(x)).

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    It looks better if $y$ou include code in backticks (\`code\`): `dsolve(x*sqrt(4+y(x)^2)+y(x)*sqrt(1+x^2)*diff(y(x),x), y(x))`2011-03-08