$\cos \left(2 \cos ^{-1} \frac{1}{5}+\sin ^{-1} \frac{1}{5}\right)$ ની કિંમત શોધો.

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

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$\cos ^{ - 1}\left( \frac{3 + 5\cos x}{5 + 3\cos x} \right)$ ની કિંમત શું થાય?

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