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[" 13.Prove that "|[x+y+2z,x,y],[z,y+z+2...

[" 13.Prove that "|[x+y+2z,x,y],[z,y+z+2x,y],[z,x,z+x+2y]|=2(x+y+z)^(3)],[" feter ",[x+y+2z,y+z+2x,y],[z,y+z+2x,y],[z,x,z+x+2y]|=2(x+y+z)^(3)]

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