find the characteristic equation of the matrix A.
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use this formula to find the characteristic equation
x³-c1x²+c2x-c3=0
where c1=sum of aii
c2=sum of minor of aii
c3=|A|
c1=6
c2=6
c3=11
put in above equation
x³-6x²+6x-11=0. characteristics equation
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