On considĂšre lâensemble $~~G~~$ des matrices carrĂ©es dâordre 2 de la forme:
$$\dfrac{1}{\sqrt {1-x^2}}~\begin{pmatrix}
1&x\\x&1
\end{pmatrix} ~~\qquad \text{oĂč}~~x~\in~]~-1~,~1~[$$
Montrer que $~~(G,\times)~~$ est un groupe commutatif.
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