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文本歌词
sin(2π+α)=sinα
cos(2π+α)=cosα
tan(2π+α)=tanα
sin(π+α)=-sinα
cos(π+α)=-cosα
tan(2π+α)=tanα
sin(π/2+α)=-cosα
sin(π/2-α)=cosα
cos(π/2+α)=-sinα
cos(π/2-α)=sinα
tan(π/2-α)=cotα
tan(π/2+α)=-cotα
sin(α+β)=cosα·cosβ+sinα·sinβ
cos(α+β)=cosα·cosβ-sinα·sinβ