Question: To tune the instruments of an orchestra before a concert, an A note is struck on a piano. The piano wire vibrates with a displacement

To tune the instruments of an orchestra before a concert, an A note is struck on a piano. The piano wire vibrates with a displacement y (in mm) given by y = 3.20 cos 880πt, where t is in seconds. Sketch the graph of y vs. t for 0 ≤ t ≤ 0.01 s.

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