$\cos (\tan ^{ - 1}(\tan 2))$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{\sqrt{5}}$
  • B
    $-\frac{1}{\sqrt{5}}$
  • C
    $\cos 2$
  • D
    $-\cos 2$

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