SOLUTION: What is the exact value of cos(-240)?

SOLUTION: What is the exact value of cos(-240)?

Algebra.Com

Question 311216: What is the exact value of cos(-240)?
Answer by nyc_function(2741) (Show Source): You can put this solution on YOUR website!
The answer is -1/2.
Memorize the unit circle and you'll fly through trigonometry.
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