How would you find the domain and range of if the domain of cos(x) is restricted to .
In Britain, the inverse cosine function is almost always written as , whereas is widely used elsewhere. Since I posted my original answer, it occurred to me that I interpreted as the inverse cosine of , whereas the question might mean . Also, I am not clear how the domain of being restricted to is relevant.
So, unless someone can clarify what the question means, I'll keep quiet!