I would appreciate to have a detailed explanation for the last one. Thank you in advance.Answers
d] here x(t) = 2.6
4.3 * cos 7.3t = 2.6
cos 7.3t = 2.6/4.3
7.3t = arccos (2.6/4.3) = 0.9215
t = 0.9215/7.3
= 0.1262s answer
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