यदि $\cos \alpha = \frac{l \cos \beta + m}{l + m \cos \beta}$ है,तो $\left(\frac{\tan \frac{\alpha}{2}}{\tan \frac{\beta}{2}}\right)^2 = $

  • A
    $\frac{l - m}{l + m}$
  • B
    $\frac{l + m}{l - m}$
  • C
    $\frac{l^2 - m^2}{l^2 + m^2}$
  • D
    $\sqrt{\frac{l - m}{l + m}}$

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