On considĂšre lâensemble $F$ des matrices carrĂ©es dâordre 2 de la forme:
$$M_{\alpha}=\begin{pmatrix}
\cos{\alpha}&-\sin{\alpha}\\
\sin{\alpha}&\cos{\alpha}
\end{pmatrix}$$
Montrer que $~~(F,\times)~~$ est un groupe commutatif.
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