5 By using 97 Mean value of Y = ], - a Ja y dr show that the mean value of the voltage v = Vsin(at) over the interval at = 0 to at = 2x is 0 V. 6 Show that the RMS value, fpus, of the current i = I cos(t) over the interval 0 to 2x is given by - IRMS = VZ where the constant / is the maximum current