MCQ
$\int \cos \frac{7 x}{9} d x=$
- A$k+\sin \frac{7 x}{9}$
- B$\frac{7}{9} \sin \frac{7 x}{9}+k$
- ✓$\frac{9}{7} \sin \frac{7 x}{9}+k$
- D$k+\cos \frac{7 x}{9}$
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