SOLUTION: what is the value of the expression cos-1 (√2\2) ?

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Question 241753: what is the value of the expression cos-1 (√2\2) ?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
cos-1 (√2\2)
is asking you what angle x would be if
cos(x) = √2\2
.
In this case, looking at the "unit circle" it would be
(pi/4) radians
or
45 degrees