Нужно разложить: sin(-1560°)
sin(-1560°)=sin(240°-1800°)=sin(240°)=sin(270°-30°)=-cos30°=-√3/2.
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sin(-1560°)=sin(240°-1800°)=sin(240°)=sin(270°-30°)=-cos30°=-√3/2.