求用C++语言实现cos(α1+α2+α3+……+αn) = 和sin(α1+α2+α3+……+αn) =的分解cos(α+β) = cosαcosβ- sinαsinβ,sin(α+β) = sinαcosβ+ cosαsinβ cos(α+β+γ) = cos(α+(β+γ)) = cosαcos(β+γ) - sinαsin(β+γ) =cosαcosβcosγ-c

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