Complex Formats
---------------

There are three supported notations for complex numbers in rectangular
form.  The default is as a pair of real numbers enclosed in
parentheses and separated by a comma: `(a,b)'.  The `d c'
(`calc-complex-notation') command selects this style.

The other notations are `d i' (`calc-i-notation'), in which numbers
are displayed in `a+bi' form, and `d j' (`calc-j-notation') which
displays the form `a+bj' preferred in some disciplines.

Complex numbers are normally entered in `(a,b)' format.
If you enter `2+3i' as an algebraic formula, it will be stored as
the formula `2 + 3 * i'.  However, if you use `=' to evaluate
this formula and you have not changed the variable `i', the `i'
will be interpreted as `(0,1)' and the formula will be simplified
to `(2,3)'.  Other commands (like `calc-sin') will *not*
interpret the formula `2 + 3 * i' as a complex number.
See Variables, under "special constants."