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If $\large\frac{x^2+x+1}{x^2+2x+1}$$=A+\large\frac{B}{x+1}+\frac{C}{(x+1)^2}$ then $A-B=$

\[\begin {array} {1 1} (1)\;4\;C & \quad (2)\;4\;C+1 \\ (3)\;3\;C & \quad (4)\;2\;C \end {array}\]

1 Answer

(4) 2C
answered Nov 7, 2013 by pady_1
 
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