$\cos \left[ {{\tan }^{ - 1}}\frac{1}{3} + {{\tan }^{ - 1}}\frac{1}{2} \right] = $

  • A
    $\frac{1}{{\sqrt 2 }}$
  • B
    $\frac{{\sqrt 3 }}{2}$
  • C
    $\frac{1}{2}$
  • D
    $\frac{\pi }{4}$

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