MCQ
$\frac{d}{d x}\left(\tan \frac{x}{3}\right)=$
- A$\sec ^2 (\frac{x}{3})$
- ✓$\frac{1}{3} \sec ^2 \frac{x}{3}$
- C$3 \sec ^2 \frac{x}{3}$
- D$3 \cot \frac{x}{3}$
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