SOLUTION: Using reference angles, find the value of cos(-210)
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Question 1018463: Using reference angles, find the value of cos(-210)
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
cos(-210) has a reference angle of 30 degrees and it is in quadrant II.
In QII, cosine is negative so
cos(-210) = - cos(30) =
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