यदि $\int \frac{dx}{x^2+2x+2}=f(x)+c$ है,तो $f(x)$ किसके बराबर है?

  • A
    $\tan^{-1}(x+1)$
  • B
    $2 \tan^{-1}(x+1)$
  • C
    $-\tan^{-1}(x+1)$
  • D
    $3 \tan^{-1}(x+1)$

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