Suppose that two sinusoidal voltages at the same frequency are added:
V1 sin wt + V2 sin (wt + 0Ï•2) = V sin (wt + Ï•)
A phasor representation is shown in the diagram.
(a) Substitute t = 0 into the equation. Interpret the result by referring to the phasor diagram.
(b) Substitute t = π/(2w) and simplify using the trigonometric identity sin (θ + π/2) = cos θ . Interpret the result by referring to the phasor diagram.

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