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$A = [\begin{matrix} 1 & i \\ - i & 1 \end{matrix}] B = [\begin{matrix} i & - 1 \\ - 1 & - i \end{matrix}]$ এবং $i = \sqrt{- 1}$ হলে, AB= কত?

[\begin{matrix} 1 & 0 \\ 0 & 0 \end{matrix}]

[\begin{matrix} 0 & 0 \\ 0 & 0 \end{matrix}]

[\begin{matrix} 1 & 0 \\ 0 & 1 \end{matrix}]

[\begin{matrix} i & 0 \\ 0 & i \end{matrix}]

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