$\tan \left[ {\frac{\pi }{4} + \frac{1}{2}{{\cos }^{ - 1}}\frac{a}{b}} \right] + \tan \left[ {\frac{\pi }{4} - \frac{1}{2}{{\cos }^{ - 1}}\frac{a}{b}} \right] = $

  • A
    $\frac{2a}{b}$
  • B
    $\frac{2b}{a}$
  • C
    $\frac{a}{b}$
  • D
    $\frac{b}{a}$

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