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4. For the following, identify the speed of the wave f (x, t) and the direction it is travelling. (10 points) (a) f(x, t) =

4. For the following, identify the speed of the wave f (x, t) and the direction it is travelling. (10 points) (a) f(x, t) = 10 cos(10x + 3t) (b) f(x, t) = -2 sin(2x - 4t - T)

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