यदि $\int \frac{x+5}{x^2+4x+5} dx = a \log(x^2+4x+5) + b \tan^{-1}(x+k) + C$ है, तो $(a, b, k)$ का मान ज्ञात कीजिए।

  • A
    $(\frac{1}{2}, 3, 2)$
  • B
    $(\frac{1}{2}, 1, 2)$
  • C
    $(\frac{1}{2}, 3, 1)$
  • D
    $(1, 3, 2)$

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