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प्रश्न
If a, b and c are real numbers, and triangle =`|(b+c, c+a, a+b),(c+a,a+b, b+c),(a+b, b+c, c+a)|` = 0 Show that either a + b + c = 0 or a = b = c.
उत्तर
Hence, if Δ = 0, then either a + b + c = 0 or a = b = c.
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