Which of the following wave equations have maximum amplitude at the origin of coordinate system ...

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Which of the following wave equations have maximum amplitude at the origin of coordinate system at time \( t=0 \) sec?
\( P \)
(A) \( y=y_{m} \sin k(x+v t) \)
(B) \( y=y_{m} \cos k(x+y t) \)
(C) \( y=y_{m} \sin k(x-v t) \)
(D) none of these.
W.
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