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Let f(x)=|(a+x,b+x,c+x),(I+x,m+x,n+x),(p...

Let `f(x)=|(a+x,b+x,c+x),(I+x,m+x,n+x),(p+x,q+x,r+x)|.` Show that `f prime prime(x)=0` and that `f(x)=f(0)+kx` where k denotes the sum of all the co-factors of the elements in `f(0).`

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