sin（-19π/6）= sin（-19π/6+4π）= sin（5π/6）=0.5
sin（-16π/3）= sin（-19π/3+6π）= sin（-π/3）=－√3/2
cos（-79π/6）=cos（-79π/6+14π)=cos（5π/6）=－√3/2
sin（-19π/6）= sin（-16π/3）= cos（-79π/6）=
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