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If A=[{:( 0,-x),(x,0):}].B=[{:(0,1),(1,0...

If `A=[{:( 0,-x),(x,0):}].B=[{:(0,1),(1,0):}]` and `x^(2)=-1` , then show that `(A+B)^(2)=A^(2)+B^(2)`.

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