I find that when I calculate $\cos{1}$ in ...
- Google: $0.540$
- Ubuntu: $0.998$
I believe its different units. But I wonder which should I be using? The question I am doing is use bisection method to find $\cos{x} = x$ when $x \in [0,1]$. For now, I am using Google as its close to what I get from a Graphing Utility