MCQ
$\int\left(\sin 3 x+4 \sin ^3 x\right) d x=$
- A$3 \sin x+k$
- ✓$-3 \cos x+k$
- C$\frac{\cos 3 x}{3}+12 \sin ^2 x+k$
- D$\frac{\cos 3 x}{3}+4 \cos ^3 x+k$
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