यदि आव्यूह A के लिए, A2 + I = 0, जहां I कोटि 2 का तत्समक आव्यूह है, तो A =

1
\(\left[ {\begin{array}{*{20}{c}} 1&0\\ 0&1 \end{array}} \right]\)
2
\(\left[ {\begin{array}{*{20}{c}} i&0\\ 0&i \end{array}} \right]\)
3
\(\left[ {\begin{array}{*{20}{c}} i&0\\ 0&1 \end{array}} \right]\)
4
\(\left[ {\begin{array}{*{20}{c}} -1&0\\ 0&-1 \end{array}} \right]\)

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