SOLUTION: express cos120 as a function of an angle in quadrant 1

Question 79068: express cos120 as a function of an angle in quadrant 1
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
To find the angle, lets take the inverse cosine of to get

So the angle is

Another way to do this is to notice that the given angle is 120 degrees (which is radians) So to find the reference angle, just subtract this angle from radians

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