यदि \( A=\left[\begin{array}{rr}3 & 1 \\ -1 & 2\end{array}\right] \) है, तो दर्शाइए कि \( A^{2}-...
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यदि \( A=\left[\begin{array}{rr}3 & 1 \\ -1 & 2\end{array}\right] \) है, तो दर्शाइए कि \( A^{2}-5 A+7 I=0 \) है तथा इसकी सहायता से \( A^{-1} \) ज्ञात कीजिए।
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