sin2π／3=sinπ／3=√3/2
cos2π／3=-cosπ／3=-1/2
sin7π／6=-sinπ／6=-1/2
cos7π／6=-cosπ／6=- √3/2
sin2π／3=?；cos2π／3=?；sin7π／6=?；cos7π／6=?说下
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