Prove that Sin4X=1/8(3-4Cos2x+Cos4x)

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Prove that Sin4X=1/8(3-4Cos2x+Cos4x)
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  1. Suresh Niroula
  2. Prove that Sin4X=1/8(3-4Cos2x Cos4x)
  3. Sin4X=1/8(3-4Cos2x Cos4x)
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