यदि $\frac{x^2+x+1}{x^2+2x+1}=A+\frac{B}{x+1}+\frac{C}{(x+1)^2}$ है,तो $A-B$ का मान क्या होगा?

  • A
    $4C$
  • B
    $4C+1$
  • C
    $3C$
  • D
    $2C$

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