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Physics: Mathmatical description of a wave; time, direction, displacement

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The displacement (in meters) of a wave is y= 0.26 sin((pie)t-3.79(pie)x, where t is in seconds and x is in meters. (a) Is the wave traveling in the +x or-x direction? (b) What is the displacement of y when t= 38s and x=13m?

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