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

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

Hi

 cos(-θ) = cosθ

 cos(-150°) = cos 150° = 

(cosx,sinx) summary:

 

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