Texas Instruments TI-89 Titanium Manual page 17

Polar format is the vector form with an angle in degrees. In
engineering it determines the values of capacitive reactance and
inductive reactance.
(Note: engineers use j instead of i as the imaginary number, but it
• Step 1 Change the mode to polar output by going into the mode
menu and scroll down to the complex vector and press enter
then choose polar.
• Step 2 Enter the equation (can be in either polar or rectangle
form)
The rectangular input will be converted to a polar output if the
calculator is in polar output mode.
The result will be (40*square root of 2 at a angle of 45 degrees)
Example: Y = 400 + 500j
is i on the calculator)