 Summary

It is concluded that
df/d zeta = df/dx and df/d eta = dg/dx
Will someone explain how this conclusion is made while differentiating
Hi
On page 81 of the book "A student's guide to waves by Fleisch and Kinneman a conclusion is made while differentiating D Alembert's solution to the wave equation.
Will someone explain this please ? The details are in the attachment
TIA
On page 81 of the book "A student's guide to waves by Fleisch and Kinneman a conclusion is made while differentiating D Alembert's solution to the wave equation.
Will someone explain this please ? The details are in the attachment
TIA
Attachments

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