MCQ

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$\int \frac{ dx }{x^2+4 x+13}=?$

• A
  $\frac{1}{6} \tan ^{-1}\left(\frac{x+2}{3}\right)+ C$
• B
  $3 \tan ^{-1}\left(\frac{x+2}{3}\right)+C$
• C
  $\frac{1}{6} \log \left(\frac{x-1}{x+5}\right)+ C$
• ✓
  $\frac{1}{3} \tan ^{-1}\left(\frac{x+2}{3}\right)+C$