Question: Assume that all the given functions have continuous second-order partial derivatives. Show that any function of the form z = f(x + at) + g(x

Assume that all the given functions have continuous second-order partial derivatives.
Show that any function of the form

z = f(x + at) + g(x - at)
is a solution of the wave equation
z. at? дх?

z. at? ?

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