HP Prime Graphing NW280AAABA manual Trigonometry

Real Part Real part x, of a complex number, (x+y*i).

RE(x+y*i)

Example:

RE(3+4*i) returns 3

Imaginary Part Imaginary part, y, of a complex number, (x+y*i).

IM(x+y*i)

Example:

IM(3+4*i) returns 4

Unit Vector Sign of value. If positive, the result is 1. If negative, –1. If zero, result is zero. For a complex number, this is the unit vector in the direction of the number.

SIGN(value)

SIGN((x,y))

Examples:

SIGN(POLYEVAL([1,2,–25,–26,2],–2)) returns –1

SIGN((3,4)) returns (.6+.8i)

Exponential

ALOG Antilogarithm (exponential).

ALOG(value)

EXPM1 Exponential minus 1: ex – 1 .

EXPM1(value)

LNP1 Natural log plus 1: ln(x+1).

LNP1(value)

Trigonometry

The trigonometry functions can also take complex numbers as arguments. For SIN, COS, TAN, ASIN, ACOS, and ATAN, see “Keyboard functions” on page 309.

CSC Cosecant: 1/sinx.

CSC(value)

ACSC Arc cosecant.

ACSC(value)

316 Functions and commands