
Code:
\[ x_{k+1}=\left[ Ax_{k}+Bx_{k-1}\right]\; ,\;\; k=1,2,...,n,... . \]

Code:
\[ x_{k+1}=\left[ Ax_{k}+Bx_{k-1}\right]\; ,\;\; k=1,2,...,n,... . \]
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