SOLUTION: Cos^-1(-1/2)

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Question 862709: Cos^-1(-1/2)
Answer by josgarithmetic(39628) About Me  (Show Source):
You can put this solution on YOUR website!
Just refer to the unit circle and the reference angles as you have likely been taught. Read the equation as, "The angle having the cosine of -%281%2F2%29".