Four waves are described by the following equations, where distances are measured in meters and times in seconds I. y = 0.15cos(2x - pi*t) II. y = 0.84sin(4x + 2pi * t) III. y = 0.62cos(4x + pi*t) IV. y = - 0.25sin(2x - 2pi * t) Which of these waves have the same speed? A. I and III B. II and III C. III and IV D. I and II E. II and IV

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