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