SOLUTION: Is cos^(-1) [cos (-pi/3)] = 1/2? Or is it - pi/3 since the functions are the same? (Cos and cos)?

SOLUTION: Is cos^(-1) [cos (-pi/3)] = 1/2? Or is it - pi/3 since the functions are the same? (Cos and cos)?

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Question 433275: Is cos^(-1) [cos (-pi/3)] = 1/2? Or is it - pi/3 since the functions are the same? (Cos and cos)?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
This is the inverse of the inverse.
cos^-1 of the cos of (Value) = Value
--> it's -pi/3
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Because cos(-x) = cos(x), it can also be +pi/3

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