sin2π/3=?;cos2π/3=?;sin7π/6=?;cos7π/6=?说下
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![sin2π/3=?;cos2π/3=?;sin7π/6=?;cos7π/6=?说下](/uploads/image/z/9452491-43-1.jpg?t=sin2%CF%80%EF%BC%8F3%3D%3F%EF%BC%9Bcos2%CF%80%EF%BC%8F3%3D%3F%EF%BC%9Bsin7%CF%80%EF%BC%8F6%3D%3F%EF%BC%9Bcos7%CF%80%EF%BC%8F6%3D%3F%E8%AF%B4%E4%B8%8B)
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sin2π/3=?;cos2π/3=?;sin7π/6=?;cos7π/6=?说下
sin2π/3=?;cos2π/3=?;sin7π/6=?;cos7π/6=?说下
sin2π/3=?;cos2π/3=?;sin7π/6=?;cos7π/6=?说下
sin2π/3=sinπ/3=√3/2
cos2π/3=-cosπ/3=-1/2
sin7π/6=-sinπ/6=-1/2
cos7π/6=-cosπ/6=- √3/2
(根号3)/2
-1/2
-1/2
-(根号3)/2
sin2π/3=√3/2;cos2π/3=-1/2;sin7π/6=-1/2;cos7π/6=-√3/2