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"10. Given \\( A = \\left[ \\begin{array} { c c } { 2 } & { - 3 } \\\\ { - 4 } & { 7 } \\end{array} \\right] \\) compute \\( A ^ { - 1 } \\) and show\nthat \\( 2 A ^ { - 1 } = 9 I - A \\) cass 2018"

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