Recently I came across the total differentiation command in the PDEtools. For its
documentation, I used the following link
Unfortunately, when I try to replicate this it did not work as expected. I am getting the total derivative of the expression to be zero. I do not understand where I am going wrong.
You can find my code above. I am also attaching the screen shot of my maple file.
I would really appreciate if someone could help me out. Thanks for your help.