Question 354998
det[a]={{{-2}}}
[a]inv={{{-(1/2)*(matrix(3,3,-18,3,10,10,-2,-6,4,-1,-2))}}}
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det[b]={{{10}}}
[b]inv={{{(1/10)*(matrix(4,4,-11,2,6,-7,4,2,-4,8,5,0,0,5,9,2,-4,3))}}}