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Question
The inverse of the matrix `[[2,0,0],[0,1,0],[0,0,-1]]`is --------
(a) `[[1/2,0,0],[0,1,0],[0,0,-1]]`
(b) `[[-1/2,0,0],[0,-1,0],[0,0,1]]`
(c) `[[-1,0,0],[0,-1/2,0],[0,0,1/2]]`
(d) `1/2[[-1/2,0,0],[0,-1,0],[0,0,-1]]`
Solution
a) `[[1/2,0,0],[0,1,0],[0,0,-1]]`
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