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