What is the inverse cosine of 0.55?

##cos^(-1)(0.55)=56.632987^o##
The inverse cosine for a number is represented as ##cos^(-1)x##. It allows you to determine the angle. So the inverse cosine of ##0.55## is ##cos^(-1)(0.55)##. Use your scientific calculator to get ##cos^(-1)(0.55)=56.632987^o##.