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[" Example "1.85" ,Show that "((x+b)(x+c...

[" Example "1.85" ,Show that "((x+b)(x+c))/((b-a)(c-a))+((x+c)(x+a))/((c-b)(a-b))],[+((x+a)(x+b))/((a-c)(b-c))=1" is an identity."]

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