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If A=[[a(11),a(12)],[a(21),a(22)]] is no...

If `A=[[a_(11),a_(12)],[a_(21),a_(22)]]` is non - singular, find `A^(-1)`.

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The correct Answer is:
`=(1)/((a_(11)a_(12)-a_(12)a_(22)))[[a_(22),-a_(12)],[-a_(21),a_(11)]]`
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