What version of MATLAB are you using?
I'm not sure what the exact question is, but evalc will execute the enclosed string as a MATLAB command and capture the result in a variable (h(x) here).
Pretty will take a symbolic expression and display it in "pretty" or more readable format, but only using ascii characters.
The use of both functions is not recommended. A live script is much better at displaying formatted math expressions without needing to call functions like pretty, and I don't see why evalc is needed.
BTW - it is much more helpful if you copy/paste your code here rather than uploading pictures of it.
