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If Delta=|{:(1,x,x^(2)),(1,y,y^(2)),(1,z...

If `Delta=|{:(1,x,x^(2)),(1,y,y^(2)),(1,z,z^(2)):}|`, `Delta_(1)=|{:(1,1,1),(yz,zx,xy),(x,y,z):}|`, then prove that `Delta+Delta_(1)=0`

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