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[" 10.If "A=([3,4],[2,4]),quad B=([-2,-2...

[" 10.If "A=([3,4],[2,4]),quad B=([-2,-2],[0,-2])," then "(A+B)^(-1)],[" (a) "A^(-1)+B^(-1)," (b) does not exist "],[" (c) is a skew symmetric matrix "," (d) none "]

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