Your expression misses the second term above.
By the way for the first equality your wrote it's just the chain rule, Chain rule - Wikipedia, the free encyclopedia
Hey, hope someone will help me
I need some help to rewrite a differential equation.
I start with the expression :
This reason why this apply (correct me if I'm wrong) is this:
Furthermore this applies:
This I can't explain, if someone could explain to me why and how (detailed if possible), it would be great.
Sorry if it is obvius, but I'm new to this.
Thanks
Your expression misses the second term above.
By the way for the first equality your wrote it's just the chain rule, Chain rule - Wikipedia, the free encyclopedia
I think you should also read about Leibniz product derivation formula, here:
Product rule - Wikipedia, the free encyclopedia