SOLUTION: What's the difference between arcos (√2/2) and cos^-1(√2/2)?

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Question 1152524: What's the difference between arcos (√2/2) and cos^-1(√2/2)?
Found 2 solutions by MathLover1, Alan3354:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Some people distinguish between the inverse cosine function (which has the range restricted so there is only one value) and arccos not having the range restricted so it is multivalued, but that doesn't seem to be your problem.
cos%5E-1%28x%29+=+arccos%28+x%29

arcos+%28sqrt%282%29%2F2%29=pi%2F4
cos%5E-1%28sqrt%282%29%2F2%29=pi%2F4

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
What's the difference between arcos (√2/2) and cos^-1(√2/2)?
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There's no difference.
Some programs use acos, some cos^-1, some arccos, some invcos...
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They all mean the angle whose cosine is ...