If $\tan \beta = \cos \theta \tan \alpha ,$ then ${\tan ^2}\frac{\theta }{2} = $

  • A
    $\frac{\sin (\alpha + \beta )}{\sin (\alpha - \beta )}$
  • B
    $\frac{\cos (\alpha - \beta )}{\cos (\alpha + \beta )}$
  • C
    $\frac{\sin (\alpha - \beta )}{\sin (\alpha + \beta )}$
  • D
    $\frac{\cos (\alpha + \beta )}{\cos (\alpha - \beta )}$

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