(A+B)^2 is not equal to A^2+B^2 by contradiction!

Previously I made a video on a "2=0 proof" from Reddit:    • "2=0 proof" from Reddit r/askmath  
However, @ovens3157 pointed out that the proof was actually to show (A+B)^2 is NOT equal to A^2+B^2 by contradiction. So here it is!

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