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IF A = ([2,-1],[-1,2]) and A^2-4A+3I = 0...

IF `A = ([2,-1],[-1,2])` and `A^2-4A+3I = 0`, where I is the unit matric or order 2, then find `A^(-1)`.

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UNITED BOOK HOUSE-QUESTION PAPER 2016-EXERCISE
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