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Prove that ("adj. "A)^(-1)=("adj. "A^(-1...

Prove that `("adj. "A)^(-1)=("adj. "A^(-1))`.

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`("adj. A")^(-1)=("adj. (adj. A)")/(|"adj. A"|)=(|A|^(n-1)A)/(|A|^(n-1))=A/(|A|)=("adj. "A^(-1))`
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