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