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Any equation \( y=f(t-b x) \) represent a harmonic wave if
\( \mathrm{P} \)
(1) \( \frac{d y}{d x}=v \frac{d x}{d t} \)
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(2) \( \frac{d^{2} y}{d t^{2}}=v^{2} \frac{d^{2} y}{d x^{2}} \)
(3) \( \frac{d^{2} y}{d t^{2}}=\frac{1}{v^{2}} \frac{d^{2} y}{d x^{2}} \)
(4) \( \frac{d y}{d x}=\frac{1}{v} \frac{d x}{d t} \)
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