Which of the following function correctly represent the travelling wave equation: \( \mathrm{P} ...

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Which of the following function correctly represent the travelling wave equation:
\( \mathrm{P} \)
(1) \( y=x^{2}-t^{2} \)
W
(2) \( y=\cos x^{2} \sin t \)
(3) \( y=\log \left(x^{2}-t^{2}\right)-\log (x-t) \)
(4) \( y=e^{2 x} \sin t \)
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