Just enter the formula
‘ninteg(sin(t)/t, t, 0,
x)’, type Z F, and answer the
questions. Since this formula contains two variables, the default
argument list will be ‘(t
x)’. We want to change this to
‘(x)’ since
‘t’ is really
a dummy variable to be used within ninteg.
The exact keystrokes are Z F s Si <RET> <RET> C-b C-b <DEL> <DEL> <RET> y. (The C-b C-b <DEL> <DEL> are what fix the argument list.)