factorise ab(a² + b² - c²) + bc(a² + b² - c²) + ca(a² + b² - c²)
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ab(a²+b²-c²) -bc(c²-a²-b²) +ca(a²+b²-c²)
ab(a²+b²+c²) +bc(-c²+a²+b²) +ca(a²+b²-c²)
ab(a²+b²+c²) +bc(a²+b²-c²) +ca(a²+b²-c²)
(a²+b²-c²) [ab+bc+ca]
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