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$\cos ^{-1} 2 x$
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