Differentiate with respect to a derivative

Question:Differentiate with respect to a derivative

Posted: DavidMarshall 5

March 16 2013

In calculus of variations one may have the integrand of a functional F = sqrt(1+(y'(x))^2)

How do I get Maple to evaluate ∂F/∂y' ? (Maple doesn't recognise y' like Mathematica does)

( The answer is, of course, y'y''/sqrt(1+(y'(x))^2) )

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