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Question: derivation with respect to the deravative

Question:derivation with respect to the deravative

mehdi jafari 764
July 19 2013
2

> with(PDEtools):
> declare(y(x), prime=x):
> ode := diff(diff(y(x),x),x)*diff(y(x),x)*y(x)*f(x)-2*diff(y(x),x)^3*x^6> + 2*diff(y(x),x)^2*y(x)*diff(g(x),x) + y(x)^5; 
 diff(ode,diff(y(x),x));
Error, invalid input: diff received diff(y(x),x), which is not valid for its 2nd argument

 i want to make deravatition with respect to the first deravatives,what should i do? 
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