how to use dchange command with new=old?

Question:how to use dchange command with new=old?

Posted: maple fan 205 Product: Maple

October 29 2019

for example,transform diff(u(x,y),x) with xi=xi(x,y) and eta=eta(x,y);

it should be

diff(u(x,y),x)=diff(u(xi,eta),xi)*diff(xi(x,y),x)+diff(u(xi,eta),eta)*diff(eta(x,y),x)

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