# If a/b=c/d the proof that ac+bd/ac-bd=a2+b2/a2-b2(Square)

Question asked by: Aamir9

Asked on: 07 Mar 2010

Because if a/b = c/d then you can substitute like with like from one equation to the other and that equality will be preserved.

By: artiste

Replied at: 07 Mar 2010

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