Cos x vs Cos-1: What's the Difference?

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Acuben
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Just a quick question.
does cos x represent something different from Cos x?
or does it only apply to inverse trig functions such as Cos[tex]^{-1}[/tex] x ?
 

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Cos(x) -- with the capital C -- typically represents the restricted-domain cosine function, with the domain being [0, 2pi].
 

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