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Hello,

I was working on Harold T. Davis

Introduction to Nonlinear Differential and Integral Equations

I saw this following equations

1-So equation 4 came as a result of chain rule applies on equation. 3 ?

2- how did equation 5 come about? And specially the "2" in second term.

3-What kind of calculus I should study, so I know this sort of stuff and I can save some time.

Thank you.

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# B Chain rule problem

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