For \( x \in(0, \pi) \), the equation \( \sin x+2 \sin 2 x-\sin 3 x... VIDEO
For \( x \in(0, \pi) \), the equation \( \sin x+2 \sin 2 x-\sin 3 x=3 \) hashttps://bit.ly/YTAI_PWAP https://www.pw.live
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