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Prove that abs{:(a^(2) + 1, ab , ac),(ab...

Prove that `abs{:(a^(2) + 1, ab , ac),(ab, b^(2) + 1, bc),(ca, cb, c^(2) +1):}=1 + a^(2) + b^(2) +c^(2)`

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The correct Answer is:
`=a^(2) + b^(2) +c^(2) +1`
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