Sin3x = 3 sin x-4 sin^3x
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Step-by-step explanation:
sin3x=sin(2x+x)
=sin2xcosx+cos2xsinx
=2sinxcosxcosx+(1−2sin 2 x)sinx
=2sinx(1−sin 2 x)+sinx−2sin 3 x
=3sinx−4sin 3 x
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