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