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OpenStudy (anonymous):
Use a graphing utility to graph the function E(t) = 110 cos(120πt −π/3). What is the period of the function?
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OpenStudy (jamesj):
The period of the function is the smallest T > 0 such that E(t+T) = E(t) Follow the procedure I used in the last question I answered for you to find T.
OpenStudy (anonymous):
The period of a*Cos(b*t+c) is 2*Pi/b So 2*Pi/(120*Pi) = 1/60 is the period
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