Найдите [tex]\lim\limits_{n \to \infty} \dfrac{A_n}{D_n}[/tex] , где [tex]\left(\begin{array}{cc}19&-48\\8&-21\end{array}\right)^n=\left(\begin{array}{cc}A_n&B_n\\C_n&D_n\end{array}\right)[/tex]
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