Question: The design of a certain three-phase alternating-current generator uses the fact that the sum of the currents I cos( + 30), I cos( + 150),

The design of a certain three-phase alternating-current generator uses the fact that the sum of the currents I cos(θ + 30°), I cos(θ + 150°), and I cos(θ + 270°) is zero. Verify this.

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