## What is the arccos of 2 ?

What is the arccosine of 2 ?

arccos 2 = ?

The arccosine is the inverse cosine function.

Since the cosine function has output values from -1 to 1,

the arccosine function has input values from -1 to 1.

So arccos x is undefined for x=2.

arccos 2 is undefined