4Sinβ * Cosβ * Cos2β = 2 * (2 * Sinβ * Cosβ) * Cos2β =
= 2 * Sin2β * Cos2β = Sin4β
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4Sinβ * Cosβ * Cos2β = 2 * (2 * Sinβ * Cosβ) * Cos2β =
= 2 * Sin2β * Cos2β = Sin4β