Question: How to find the Jacobian in this case?

Hello

Consider

alias(x=x(t),y=y(t),phi1=phi1(x(t),y(t)));

phi:=[x,ph1];



I need to calculate the Jacobian of phi in relation to x and y (and finally to t)  but using VectorCalculus[Jacobian] does not work. I guess it is because of the time dependence.   What am I missing?  

Can the Physics package be used?

Many thanks.

 

 

 

 

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