Prove that sin3x = 3sinx - 4sin³x

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sin3x = 3sinx - 4sin³x
sin 3x = 3sin x - 4sin ^3x
3sinx-4sin^3x formula
what is the maximum value of 3sinx-4sin^3x
3sinx-4sin^3x is increasing
#math #trigonometry
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