[" Illustration "4.46quad " If "f(x)=|[x...

[" Illustration "4.46quad " If "f(x)=|[x+a^(2),ab,ac],[ab,x+b^(2),bc],[ac,bc,x+c^(2)]|" ,then "],[" prove that "f'(x)=3x^(2)+2x(a^(2)+b^(2)+c^(2))]

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