restart;
evalf(Int(cosh(t)/(cosh((17/15)*t)+cosh(t)), t = 0 .. infinity));

5.210624833

evalf(int(cosh(t)/(cosh((17/15)*t)+cosh(t)), t = 0 .. infinity));

2.720144439

 

I cannot insert a code edit region in a new document in maple 12. When I clicked Insert-> code edit region, nothing happened. But if I open a example document shiped with maple 12, I can insert a code edit region. What's the problem?