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![prove that |[b+c, c+a, a+b],[c+a, a+b, b+c],[a+b, b+c, c+a]| = 2(a+b+c)(ab+be+ca-a^2 - b^2 - c^2).](/vi/FkDENDYB9nY/mqdefault.jpg)
prove that |[b+c, c+a, a+b],[c+a, a+b, b+c],[a+b, b+c, c+a]| = 2(a+b+c)(ab+be+ca-a^2 - b^2 - c^2).
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