sin2π/3=sinπ/3=√3/2
cos2π/3=-cosπ/3=-1/2
tg2π/3=-√3
ctg2π/3=-√3/3
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sin2π/3=sinπ/3=√3/2
cos2π/3=-cosπ/3=-1/2
tg2π/3=-√3
ctg2π/3=-√3/3