SOLUTION: What is the exact value of cos(-150)?

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Question 441384: What is the exact value of cos(-150)?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

 cos(-θ) = cosθ

 cos(-150°) = cos 150° = -sqrt%283%29%2F2

(cosx,sinx) summary: