What is the value of cos(2π3)?
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cos2π/3=cos(90°+30°)=-sin30°=-1/2
cos2π3=cos(2π3+0°)=cos0°=1
cos2π3=cos(2π3-0°)=cos0°=1
cos2π3=cos1080=1
cos2π3=cos(2π3+0°)=cos0°=1
cos2π3=cos(2π3-0°)=cos0°=1
cos2π3=cos1080=1
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