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OpenStudy (anonymous):
The voltage, V (in volts), in an electrical outlet is given as a function of time, t (in seconds), by the function V(t) = 156cos(120πt) The derivative is -18720pisin(120pit) second derivitive is -2246400pi^2cos(120pit) . To find the Maximum value of the rate of change do I set the second derivative equal to zero?
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