NAME

sin (_lsin), cos (_lcos), tan (_ltan), asin (_latan), acos (_lacos), atan (_latan), atan2 (_latan2) − trigonometric functions

SYNOPSIS

#include <math.h>

float sin (x)
float x;

long float _lsin (x)
long float x;

float cos (x)
float x;

long float _lcos (x)
long float x;

float tan (x)
float x;

long float _ltan (x)
long float x;

float asin (x)
float x;

long float _lasin (x)
long float x;

float acos (x)
float x;

long float _lacos (x)
long float x;

float atan (x)
float x;

long float _latan (x)
long float x;

float atan2 (y, x)
float x, y;

long float _latan2 (y, x)
long float x, y;

DESCRIPTION

Sin (_lsin), cos (_lcos), and tan (_ltan) return respectively the sine, cosine and tangent of their argument, which is in radians. 

Asin (_lasin) returns the arcsine of x, in the range −π/2 to π/2.

Acos (_lacos) returns the arccosine of x, in the range 0 to π.

Atan (_latan) returns the arctangent of x, in the range −π/2 to π/2.

Atan2 (_latan2) returns the arctangent of y/x, in the range −π to π, using the signs of both arguments to determine the quadrant of the return value.

DIAGNOSTICS

An invalid argument to any of the math routines raises a floating point exception with the operation MATH, and with _mathfunc_id set to indicate the function causing the exception. 

All of the routines check their input for the erroneous values NaN and ∞, raising an exception with the type code set to INVALID_OP_A, and INVALID_OP_F2, respectively. 

Arguments of magnitude greater than 1.0 cause asin (_lasin) and acos (_lacos) to raise a floating point exception after setting the type code to DOMAIN_ERROR.

If their argument is too large for accurate range reduction, sin (_lsin), and cos (_lcos) raise a floating point exception with the type code set to CANT_REDUCE_RANGE.

SEE ALSO

fpsignal(3C). 

Version 2.3  —  July 04, 1985