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1. Use trigonometric identity
Given that
,
![\sin^3 x = \frac{1}{4} [3\sin x - \sin (3x)]](https://s0.wp.com/latex.php?latex=%5Csin%5E3+x+%3D+%5Cfrac%7B1%7D%7B4%7D+%5B3%5Csin+x+-+%5Csin+%283x%29%5D&bg=ffffff&fg=000000&s=0 "\sin^3 x = \frac{1}{4} [3\sin x - \sin (3x)]")
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