MCQ
$\frac{d}{d x}\left(\sin ^{-1} \frac{1}{x}\right)=$
- ✓$-\frac{1}{x \sqrt{x^2-1}}$
- B$\frac{1}{x \sqrt{x^2-1}}$
- C$\frac{1}{\sqrt{x^2-1}}$
- D$\frac{1}{x \sqrt{1-x^2}}$
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