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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.)