cos-1 x vs Cos-1

[Acuben]

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^{-1} x ?

[Mark44]

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

[Acuben]

oki thanks