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+# Question 1
+
+$$
+A = \begin{pmatrix}
+1 & 0 & 2 \\
+2 & -1 & 1 \\
+0 & -2 & 1
+\end{pmatrix} = (A_{ij})
+;\;
+b = \begin{pmatrix}
+-1 \\
+0 \\
+2
+\end{pmatrix}
+$$
+$$
+X = Ab = \begin{pmatrix}
+1 & 0 & 2 \\
+2 & -1 &1 \\
+0 & -2 & 1
+\end{pmatrix}
+\begin{pmatrix}
+-1 \\
+0 \\
+2
+\end{pmatrix}
+= \begin{pmatrix}
+3 \\
+0 \\
+2
+\end{pmatrix}
+$$
+$$
+\begin{pmatrix}
+3 & 1 & 2 \\
+1 & 4 & 3 \\
+0 & 0 & 1
+\end{pmatrix}
+\begin{pmatrix}
+-2 \\
+0 \\
+2
+\end{pmatrix}
+= \begin{pmatrix}
+-2 \\
+4 \\
+2
+\end{pmatrix}
+$$
+# Question 2
+### Matrice de rotation
+
+$$
+R = \begin{pmatrix}
+\cos \theta & -\sin \theta \\
+\sin \theta & \cos \theta
+\end{pmatrix}
+$$
+### Matrice orthogonale
+
+$$A^TA = Id$$
+0
+
+### Matrice de passage
+
+
+Stage ds secteur + large que annonce
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