4sinβ * cosβ * 2cosβ = 8sinβ * cos²β = 8sinβ * (1 - sin²β) = 8sinβ - 8sin³β
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4sinβ * cosβ * 2cosβ = 8sinβ * cos²β = 8sinβ * (1 - sin²β) = 8sinβ - 8sin³β