I know that there is a difference between absolute error and relative error, but what about the term actual error?
This came up in the notes for an example problem, but I haven't been able to find any clear answers. My intuition is that actual is synonymous with absolute, but I'm not sure. It's also possible that the author made a mistake and meant to use one of the two (or even a different) term.
Please note that I'm not asking or confused about "actual value", which I know is used in the definition of absolute error.
Here is the passage in context:
Consider the error bound formula:
Find a value for K. Then find an upper bound for the error when calculating $T_4$. How does this upper bound for the error compare with the actual error between $\int_0^\pi\cos (e^x)dx$ and $T_4$?