Can somebody show the missing step/s between (8.18) and (8.19)? The equation comes from a book on electrical circuits.
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Can somebody show the missing step/s between (8.18) and (8.19)? The equation comes from a book on electrical circuits.
Try working in reverse, it's just a recognition of evaluating a derivative using a product rule...Quote:
Originally Posted by p75213
Quote:
Originally Posted by Prove It
I see what you mean.
Just to confirm, being i the imaginary unit, first term should vanish as di/dt=0?
Most definitely NOT. In electrical engineering, i is current, and j is the square root of minus one, in order to avoid just this confusion. The current i = i(t) is a function of time.Quote:
Originally Posted by rulmismo