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sin 3x + sin 2x - sin x= 4 sin x cos""(x...

`sin 3x + sin 2x - sin x= 4 sin x cos""(x)/(2) cos""(3x)/(2)`

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sin 3x + sin 2x - sin = 4sin x cos "" x/2 cos "" (3x)/(2)

sin 3x + sin 2x - sin = 4sin x cos "" x/2 cos "" (3x)/(2)

sin 3x + sin 2x - sin = 4sin x cos "" x/2 cos "" (3x)/(2)

sin 3x + sin 2x - sinx = 4sin x cos "" x/2 cos "" (3x)/(2)

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