SOLUTION: How can I know that the inverses of trig functions are actually not functions at all? Thanks

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Question 1101282: How can I know that the inverses of trig functions are actually not functions at all?
Thanks
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
They have more then one value.
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eg, arcsin(1/2) = 30, 150, 390, etc degrees