MCQ
$\frac{d}{d x}\left(\sin \frac{4 x}{5}\right)=$
- ✓$\frac{4}{5} \cos \frac{4 x}{5}$
- B$-\frac{4}{5} \cos \frac{4 x}{5}$
- C$\frac{5}{4} \cos \frac{4 x}{5}$
- D$-\frac{5}{4} \cos \frac{4 x}{5}$
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