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OpenStudy (anonymous):

what is the domain and range of y=cos^-1 x

OpenStudy (rogue):

This belongs more in the math section than the physics section. The domain of arccosine is simply the range of cosine since they are inverse functions. So its domain would be [-1, 1]. The range of the arccosine is the domain of cosine, with restrictions. Without restrictions, it wouldn't be a function. The range is [0, pi].

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