यदि $\int \frac{dx}{5 + 4\cos x} = \lambda \tan^{-1} \left( m \tan \frac{x}{2} \right) + C$ है,तो:

  • A
    $\lambda = 2/3$
  • B
    $m = 3$
  • C
    $\lambda = 1/3$
  • D
    $m = 2/3$

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