Ononot — A transformation T maps vectors in \mathbb{R}^2 using the ma

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A transformation $T$ maps vectors in $\mathbb{R}^2$ using the matrix $M = \begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ . If a vector $v$ is transformed twice (i.e., $T(T(v))$ ), which matrix represents this composition?