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Please help and explain The power P in a circuit is P = Ri, where R is resistance and i is the current. Find ah

Please help and explain

The power P in a circuit is P = Ri, where R is resistance and i is the current. Find ah at t = _ if R = 3000 $2 and i varies according to i = sin (4xt) (time in seconds). (Use symbolic notation and fractions where needed.) dP at =7

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