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If A=[(1, 0,-3 ),(2, 1 ,3 ),(0, 1 ,1)] ...

If `A=[(1, 0,-3 ),(2, 1 ,3 ),(0, 1 ,1)]` , then verify that `A^2+A=A(A+I)` , where `I` is the identity matrix.

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RD SHARMA ENGLISH-ALGEBRA OF MATRICES-All Questions
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