Consider the matrix A=(1201)A = \begin{pmatrix} 1 & 2 \\ 0 & 1 \end{pmatrix}A=(1021). Calculate A2A^2A2.
(1401)\begin{pmatrix} 1 & 4 \\ 0 & 1 \end{pmatrix}(1041)
(1201)\begin{pmatrix} 1 & 2 \\ 0 & 1 \end{pmatrix}(1021)
(1301)\begin{pmatrix} 1 & 3 \\ 0 & 1 \end{pmatrix}(1031)
(1001)\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}(1001)