GOOBER19681 GOOBER19681 Today at 4:46 AM Engineering Answered Calculate the effective value of each of the periodic voltages: (a) 6 cos 25t; (b) 6 cos 25t+ 4 sin (25t+30°); (c) 6 cos 25t+ 5 cos2(25t); (d) 6 cos 25t+ 5 sin 30t +4 V.