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Question: Function of (x,y,y') ?

Question:Function of (x,y,y') ?

law47 15 Maple
diff operator
November 23 2015
2

Hello, 

I am trying to get W(x,y,y')=y*y'/x

I am trying 

omega:=(x, y(x), (diff(y(x),x)))-> (y(x)*(diff(y(x), x))/x);

but get 

Error, invalid parameter; functional operators require their parameters to be of type symbol or (symbol::type)

 

Can anyone help me out?

 

thank you
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