show that Sin3x = 3 sin x-4sin
![show \: \: that \: \: sin3x = 3sinx - 4sin3x show \: \: that \: \: sin3x = 3sinx - 4sin3x](https://tex.z-dn.net/?f=show+%5C%3A++%5C%3A+that+%5C%3A++%5C%3A+sin3x+%3D+3sinx+-+4sin3x)
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