MCQ
$\cos ^{-1} x+\sec ^{-1} \frac{1}{x}=$
  • A
    $\frac{\pi}{2}$
  • $\cos ^{-1}\left(2 x^2-1\right)$
  • C
    $\cos ^{-1}\left(1-2 x^2\right)$
  • D
    $\cos ^{-1} 2 x$

Answer

Correct option: B.
$\cos ^{-1}\left(2 x^2-1\right)$
B

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