Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
EasyIf $\alpha = \frac{180^{\circ}}{7}$,then $3 \sin \alpha - 4 \sin^{3} \alpha$ is equal to
- A$\cos 4 \alpha$
- B$\sin 4 \alpha$
- C$\cos 3 \alpha$
- D$0$
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