\STATE {//Calcul du gradient de $ L $ :}
\STATE $\nabla L((x_k,y_k,z_k),(\lambda_1,\lambda_2)) = \nabla J(x_k,y_k,z_k) + \lambda_1 \nabla g_1(x_k,y_k,z_k) + \lambda_2 \nabla g_2(x_k,y_k,z_k)) $ \hfill $//résultat : (600, 400, 0)$
\STATE $ \varepsilon_k = \norme{\nabla L((x_k,y_k,z_k),(\lambda_1,\lambda_2))}$
\STATE {//Calcul du gradient de $ L $ :}
\STATE $\nabla L((x_k,y_k,z_k),(\lambda_1,\lambda_2)) = \nabla J(x_k,y_k,z_k) + \lambda_1 \nabla g_1(x_k,y_k,z_k) + \lambda_2 \nabla g_2(x_k,y_k,z_k)) $ \hfill $//résultat : (600, 400, 0)$
\STATE $ \varepsilon_k = \norme{\nabla L((x_k,y_k,z_k),(\lambda_1,\lambda_2))}$