Find tge sum of a²-b²,b²-c²,c²-a²
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= (a² - b²) + (b² - c²) + (c² - a²)
= a² - b² + b²- c² + c² - a²
= a²- a² + b² - b² + c²- c²
= 0 + 0 + 0
= 0
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