HP 50g Graphing Calculator - Manual (Page 174)

Page 4-7
This first screen shows functions RE, IM, and C R. Notice that the last function
returns a list {3. 5.} representing the real and imaginary components of the
complex number:
The following screen shows functions R C, ABS, and ARG. Notice that the
ABS function gets translated to |3.+5.·i|, the notation of the absolute value.
Also, the result of function ARG, which represents an angle, will be given in the
units of angle measure currently selected. In this example, ARG(3.+5.·i) =
1.0303… is given in radians.
In the next screen we present examples of functions SIGN, NEG (which shows
up as the negative sign - ), and CONJ.
CMPLX menu in keyboard
A second CMPLX menu is accessible by using the right-shift option associated
with the 1 key, i.e., ‚ß. With system flag 117 set to CHOOSE boxes,
the keyboard CMPLX menu shows up as the following screens: