SOLUTION: sketch each angle and its reference triangle in the unit circle. then sketch to find each exact value. 
sin 2π/3
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Question 1110949:  sketch each angle and its reference triangle in the unit circle. then sketch to find each exact value. 
sin 2π/3 
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
 Good idea, but I don't think you can find the exact value from a sketch.
 
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