(x-a)(x-b)/(c-a)(c-b)+(x-b)(x-c)/(a-b)(a-c)+(x-c)(x-a)/(b-c)(b-a)

1.	(x-a)(x-b)/(c-a)(c-b)+(x-b)(x-c)/(a-b)(a-c)+(x-c)(x-a)/(b-c)(b-a)
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