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Question: sometimes i see the power of a signal written as...

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rT lim (t) dt

Sometimes I see the power of a signal written as above. Other times I see it written as (T, /2 P= lim (t)2 dt . Are they two equations equal? Also, what about when the limits are from zero to T? Are all three the same? When can you use limits 0 to T?

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