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## Main Question or Discussion Point

This is the derivative of an expression that contains terms of the form (partial derivatives)*differentials. Are you supposed to apply the product rule to the (partial)*differential terms? And with respect to what variable?

I've tried different ways but didn't get the right result, so if anyone could tell me just the procedure I would appreciate it very much.

Thanks in advance

I've tried different ways but didn't get the right result, so if anyone could tell me just the procedure I would appreciate it very much.

Thanks in advance