1-20. Demonstrate that Equation (1-50) can be derived from Equation (1-49) using simple trigonometric identities:
p(t) = v(t) i(t) = 2VI cosωt cos(ωt − θ) (1-49)
p(t) = VI cosθ (1 + cos2ωt) + VI sinθ (1-50)
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