HP 40G manual Complex number functions, Arg, Conj

Complex number functions

	These functions are for complex numbers only. You can also
	use complex numbers with all trigonometric and hyperbolic
	functions, and with some real-number and keyboard
	functions. Enter complex numbers in the form (x,y), where x
	is the real part and y is the imaginary part.
ARG	Argument. Finds the angle defined by a complex number.
	Inputs and outputs use the current angle format set in Modes.
	ARG((x,y))
	Example
	ARG((3,3)) returns 45 (Degrees mode)
CONJ	Complex conjugate. Conjugation is the negation (sign
	reversal) of the imaginary part of a complex number.
	CONJ((x,y))
	Example
	CONJ((3,4)) returns (3,-4)
IM	Imaginary part, y, of a complex number, (x,y).
	IM ((x,y))
	Example
	IM((3,4)) returns 4
RE	Real part x, of a complex number, (x,y).
	RE((x,y))
	Example
	RE((3,4)) returns 3

10-8 Using mathematical functions