Question

If a, b and c are real numbers, and ∆= $\left\begin{vmatrix}b+c&c+a&a+b\\c+a&a+b&b+c\\a+b&b+c&c+a\end{vmatrix}\right$
Show that either a + b + c = 0 or a = b = c.

Answer 1

Answer:

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