(Solution) - The wave shown in red in Fig E1 2 is given -(2025 Original AI-Free Solution)

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The wave shown in red in Fig. E1.2 is given by u = 5cos2pt=8. Of the following four equations:
(1) ? = 5cos(2?t / 8 - ? / 4),
(2) ? = 5cos(2?t / 8 + ? / 4),
(3) ? = -5cos(2?t=8 / ? / 4),
(4) ? = 5sin 2?t / 8,
(a) which equation applies to the green wave?
(b) which equation applies to the blue wave?