SOLUTION: please sketch the graph of this function: f(x)=2 arccos x

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Question 259200: please sketch the graph of this function: f(x)=2 arccos x
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
There seems to be a glitch in the software that's causing it to plot cos(x) instead of arccos(x).
Check out the link
http://www.wolframalpha.com/input/?i=graph+of+2*arccos%28x%29