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If A={:[(1,-1,0),(-1,2,1),(0,1,1)]and B ...

If `A={:[(1,-1,0),(-1,2,1),(0,1,1)]and B ={:[(1,1,-1),(0,1,-1),(0,0,1)]` show that `B^(T)AB` is a diagonal matrix, where `B^(T)` is the transpose of B.

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