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    				| 1. | यदि `(If)= A [-1,-1),(2,-2)]`, दिखाएँ की `A^(2) +3A +4I_(2) = O ` तथा इससे`A^(-1)` निकले । | 
| Answer» `[(-(1)/(2),(1)/(4)),(-(1)/(2),-(1)/(4))]` | |