SOLUTION: Solve cos-1(1/2).

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Question 339978: Solve cos-1(1/2).
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Since both cos%28pi%2F3%29=1%2F2 and cos%28-pi%2F3%29=1%2F2, this means that or . You can add 2pi to the second angle to get -pi%2F3%2B2pi=5pi%2F3


So or where the angle is in the interval from 0 to 2pi


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Jim