Question
If $A=$, find $\left(A^{\top}\right)^{\top}$.
✓
Answer
$A=\left[\begin{array}{ccc}7 & 3 & 1 \\ -2 & -4 & 1 \\ 5 & 9 & 1\end{array}\right]$
$\therefore \quad A^{\mathrm{T}}=\left[\begin{array}{ccc}7 & -2 & 5 \\ 3 & -4 & 9 \\ 1 & 1 & 1\end{array}\right]$
$\therefore \quad\left(A^{\mathrm{T}}\right)^{\mathrm{T}}=\left[\begin{array}{ccc}7 & 3 & 1 \\ -2 & -4 & 1 \\ 5 & 9 & 1\end{array}\right]$
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