Consider the functions E1 = 3 cos ωt and E2 = 4 sin ωt. First prove that E2 = 4 cos (ωt — π/2). Then, using phasors and referring to Fig. P.7.10, show that E3=E1 + E2 = 5 cos (ωt-φ); determine φ. Discuss the values of E3 wherever either E1=0 or E2 = 0. Does E3 lead or lag E1 ? Explain.
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