$\cos \left(2 \cos ^{-1} \frac{1}{5}+\sin ^{-1} \frac{1}{5}\right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{5}$
  • B
    $\frac{-2 \sqrt{6}}{5}$
  • C
    $-\frac{1}{5}$
  • D
    $\frac{\sqrt{6}}{5}$

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Difficult
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यदि $(\tan ^{-1} x)^2+(\cot ^{-1} x)^2=\frac{5 \pi^2}{8}$ है,तो $x$ का मान ज्ञात कीजिए।

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