Khalid AH thinks this is interesting: (i1 + i2)2 = i12 + 2i1i2 + i12 From CHAPTER 2: Circuit Elements from Introduction to Electric Circuits, 9th Edition by Richard C. Dorf, James A. Svoboda Publisher: John Wiley & Sons Released: March 2013 Note ? Share this highlight http://www.safaribooksonline.com/a/introduction-to-electric/9456162/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Have an account? Sign in. Minimise Unlock the rest of Introduction to Electric Circuits, 9th Edition and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.