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"If "=(ax^(2))/((x-a)(x-b)(x-c))+(bx)/((...

`"If "=(ax^(2))/((x-a)(x-b)(x-c))+(bx)/((x-b)(x-c))+(c)/(x-c)+1," prove that "(y')/(y)=(1)/(x)((a)/(a-x)+(b)/(b-x)+(c)/(c-x)).`

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