(125/19)cos(1.8t)-(125/19)cos(2t) I tried 2pi/1.8 but did not work
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It can be shown that the slow oscillation is given by (2*Pi)/(2.0 - 1.8) = 10*Pi In general, the slow oscillation (envelope) uses the difference of the two arguments, and the fast oscillation uses half the sum of the two arguments.
Thank you!! It did work!
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