Texas Instruments TI-83 PLUS - Manual (Page 87)

TI-83 Plus Math, Angle, and Test Operations 84
Entering and Using Complex Numbers
Complex-Number Modes
The TI-83 Plus displays complex numbers in rectangular form and polar
form. To select a complex-number mode, press z , and then select
either of the two modes.
•
a+b i (rectangular-complex mode)
•
re^ q i (polar-complex mode)
On the TI-83 Plus , complex numbers can be stored to variables. Also,
complex numbers are valid list elements.
In Real mode, complex-number results return an error, unless you
entered a complex number as input. For example, in Real mode ln( L 1)
returns an error; in a+b i mode ln( L 1) returns an answer.