To do this, start Emacs. Then press Alt-x shell <return>.
(Long description: Run emacs by typing emacs in an x-terminal.
Press the Alt-key and <x> at the same time. Then type s-h-e-l-l, press the <return>-key).
Here is how your screen looks like after integrating sin(x^2+1):
Same in Symaxx:
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