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\sin^{3} x + \sin^{3} (120 ° + x) + \sin^{3} (240 ° + x) = ?

- 3 \sin 3 x

- \frac{1}{4} \sin 3 x

\frac{3}{4} \sin 3 x

- \frac{3}{4} \sin 3 x

- \frac{1}{3} \sin 3 x

ANS : 4

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