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Prove that |{:(2,alpha+beta+gamma+delt...

Prove that
`|{:(2,alpha+beta+gamma+delta,alphabeta +gammadelta),(alpha+beta+gamma+delta,2(alpha+beta)+(gamma+delta),alphabeta(gamma+delta)+gammadelta(alpha+beta)),(alphabeta+gammadelta,alphabeta(gamma+delta)+gammadelta(alpha+beta),2alphabetagamma delta):}|`=0

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The correct Answer is:
`|{:(1,1,0),(alpha+beta,gamma+delta,0),(alphabeta,deltagamma,0):}|xx|{:(1,gamma+delta,deltagamma),(1,alpha+beta,alphabeta),(0,0,0):}|`
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