Question: 11. Show that if a C function f(x) and a Cl function g(x) are periodic of period 2L and ( g(x) dx = 0, then

11. Show that if a C function f(x) and a Cl function g(x) are periodic of period 2L and ( g(x) dx = 0, then u(x, t), given by D'Alembert's formula, is periodic in t of period 24

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