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23. If u = f(x — сt) + g(x+ct), show that д?и дх2 1 Ә?u с2 Әt2
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23. If u = f(x — сt) + g(x+ct), show that д?и дх2 1 Ә?u с2 Әt2
23. If u = f(x — сt) + g(x+ct), show that д?и дх2 1 Ә?u с2 Әt2
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