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The electricity from an outlet in the United Kingdom has a frequency of 60 cycles per second. If current in amps (i) and time (t)

The electricity from an outlet in the United Kingdom has a frequency of 60 cycles per second. If current in amps (i) and time (t) are related sinusoidally and the current is at its maximum of 7 at t 0 , what is the current at t 4 ?

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