HP-UX Reference (11i v2 07/12) - 3 Library Functions A-M (vol 6)

cotd(3M) cotd(3M)

(Itanium(R)-based System Only)

NAME

cotd( ), cotdf( ), cotdl(), cotdw( ), cotdq() - cotangent functions of an argument speciﬁed in degrees

SYNOPSIS

#include <math.h>

double cotd(double x);

float cotdf(float x);

long double cotdl(long double x);

extended cotdw(extended x);

quad cotdq(quad x);

DESCRIPTION

These functions are available only for Itanium-based systems.

cotd() returns the cotangent of x (x speciﬁed in degrees).

cotdf() is a float version of cotd(); it takes a float argument and returns a float

result.

cotdl() is a long double version of cotd(); it takes a long double argument and returns a

long double result.

cotdw() is an extended version of cotd(); it takes an extended argument and returns an

extended result.

cotdq() is equivalent to cotdl() on HP-UX systems.

USAGE

To use these functions compile either with the default -Ae option or with the -Aa

and

-D_HPUX_SOURCE options.

To use

cotdw() or cotdq(), compile also with the -fpwidetypes option.

To use any of these functions, make sure your program includes <math.h>, and link in the math library

by specifying -lm on the compiler or linker command line.

RETURN VALUE

cotd(±0) returns ±INFINITY.

If x is ±INFINITY, cotd() returns NaN and raises the invalid exception.

If x is NaN,

cotd() returns NaN.

ERRORS

No errors are deﬁned.