# Thread: Can Someone Help Me find the Period of the slow oscillation of....

1. ## Can Someone Help Me find the Period of the slow oscillation of....

(125/19)cos(1.8t)-(125/19)cos(2t)

I tried 2pi/1.8 but did not work

2. 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.

3. Thank you!! It did work!