MCQ
$2 \cos ^{-1} \mathrm{x}$ का मान है-
- A$\sin ^{-1}\left(2 x^{2}-1\right)$
- B$\cos ^{-1}\left(2 \mathrm{x}^{2}-1\right)$
- C$\cos ^{-1} \sqrt{1-x^{2}}$
- D$\sec ^{-1} \frac{1}{x}$
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