If \( A \) is a \( 3 \times 3 \) non-singular matrix such that \( A...

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If \( A \) is a \( 3 \times 3 \) non-singular matrix such that \( A A^{T}=A^{T} A \) and \( B=A^{-1} A^{T} \), then
\[
B B^{T}=.
\]
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