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Consider the wave shown in the image below. Which of the following wave equations describes this wave? Assume $x$ $=$ $0$.
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$y(t)=6.0\cos ( 8\pi t) $
$y(t)=3.0\cos (8\pi t)$
$y(t)=3.0\cos (4\pi t) $
$y(t)=6.0\cos (4\pi t) $