How many possible values for y are there where y = cos^-1 0?

Question

anonymous · Answer

If you mean $$y= \cos^{-1}(0) $$ then are infinitly many of them.
Like $$ \pm \frac \pi 2 + 2 k \pi, k=0,\pm 1, \pm 2, ....
$$

anonymous · Answer

hell no

anonymous · Answer

arccosine is a well defined function
one input
one output

$$\cos^{-1}(0)=\frac{\pi}{2}$$ and no other number

anonymous · Answer

I agree with you if you restrict the domain to get a function.  But there are infinite values x so that cos(x)=0

anonymous · Answer

and i agree with you that there are infinitely many x such that $\cos(x)=0$  
however there is only one $\cos^{-1}(0)$

anonymous · Answer

Depending how you define the question.

anonymous · Answer

In some books Arccos is the one valued function and $$ \cos^{-1} $$ is the multivalued function.