$x=\frac{1}{5}$ पर $\cos \left(2 \cos ^{-1} x+\sin ^{-1} x\right)$ का मान ज्ञात कीजिए,जहाँ $0 \leq \cos ^{-1} x \leq \pi$ और $-\frac{\pi}{2} \leq \sin ^{-1} x \leq \frac{\pi}{2}$ है।

  • A
    $\frac{\sqrt{6}}{5}$
  • B
    $-\frac{\sqrt{6}}{5}$
  • C
    $\frac{2 \sqrt{6}}{5}$
  • D
    $-\frac{2 \sqrt{6}}{5}$

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