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 section Variables, under "special constants."

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