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

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