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If (3x^(2)+x+1)/(x-1)^(4)=A/(x-1)+B/(x-1...

If `(3x^(2)+x+1)/(x-1)^(4)=A/(x-1)+B/(x-1)^(2)+C/(x-1)^(3)+D/(x-1)^(4) " then " A+B-C+D=`

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