The voltage, V (in volts), in an electrical outlet is given as a function of time, t (in seconds), by the function V(t) = 156 cos(120πt).
(a) Find the rate of change of voltage with respect to time.
V '(t) =
ok so i found the rate of change, it is
now it wants to know the maximum value of the rate of change...can someone tell how to find it please..thanks