$x=\frac{1}{5}$ पर $\cos \left(2 \cos ^{-1} x+\sin ^{-1} x\right)$ का मान है

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

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$\cot \left(\operatorname{cosec}^{-1} \frac{5}{3}+\tan ^{-1} \frac{2}{3}\right)$ का मान ज्ञात कीजिए।

यदि $\sin^{-1} x + \sin^{-1} y = \frac{2\pi}{3}$ है,तो $\cos^{-1} x + \cos^{-1} y = $

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