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What is the inverse of : [[1,0,0],[0,1,0...

What is the inverse of :
`[[1,0,0],[0,1,0],[0,0,1]]`

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`I=[[1,0,0],[0,1,0],[0,0,1]]` is a `3xx3` unit matrix
`:.I^2=I`
`impliesI^-I=I`
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