I just have discovered that it is possible to incorporate calculation in a text cell (you can create a text cell by typing Alt+7) by highlighting the formula and typing Ctrl+Shilt+Enter, but in the following case the output is a ugly
InputForm result. How can I get a good-looking 2D expression as the output?
Here is the formula
\!\( \*SubsuperscriptBox[\(∫\), \(0\), \(t\)]\( \*SuperscriptBox[\(E\), \(\(-\ ρ\)\ s\)] \[DifferentialD]s\)\)