MCQ
$\frac{d}{d x}\left(2 \tan ^{-1} x\right)=$
  • A
    $\frac{1}{1+x^2}$
  • $\frac{2}{1+x^2}$
  • C
    $\frac{1}{2} \cdot \frac{1}{\left(1+x^2\right)}$
  • D
    $\frac{1}{2} \cdot \frac{1}{\left(1-x^2\right)}$

Answer

Correct option: B.
$\frac{2}{1+x^2}$
B

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