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#### 6.7.4 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.”