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  5. AB=1/4((A+B)^2-(A-B)^2) is an amazing identity, and...

AB=1/4((A+B)^2-(A-B)^2) is an amazing identity, and unfortunately, I have to remind my current students how to prove it.

Ronald Graham
Science, Identity, Students
AB=1/4((A+B)^2-(A-B)^2) is an amazing identity, and unfortunately, I have to remind my current students how to prove it.