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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