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OpenStudy (anonymous):
helppp
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OpenStudy (anonymous):
OpenStudy (anonymous):
With what?
OpenStudy (anonymous):
Ah.
OpenStudy (anonymous):
ok inverse trig, domain is \[[-1,1]\] for since and cosine, but this one has domain \[[-4,4]\] which is a big hint
OpenStudy (anonymous):
only one has that domain, and that is \[\arccos(\frac{x}{4})\] here is the picture http://www.wolframalpha.com/input/?i=arccos%28x%2F4%29
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OpenStudy (anonymous):
whats arccos of 1/2?
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