NAME

sin, cos, tan, asin, acos, atan, atan2 − trigonometric functions

SYNOPSIS

#include <math.h>

double sin(x)
double x;

double cos(x)
double x;

double asin(x)
double x;

double acos(x)
double x;

double atan(x)
double x;

double atan2(y, x)
double x, y;

DESCRIPTION

Sin, cos and tan return trigonometric functions of radian arguments. 

Asin returns the arc sin in the range −π/2 to π/2. 

Acos returns the arc cosine in the range 0 to π. 

Atan returns the arc tangent of x in the range −π/2 to π/2. 

Atan2 returns the arc tangent of y/x in the range −π to π. 

DIAGNOSTICS

These functions handle exceptional arguments in the spirit of IEEE standard P754 for binary floating point arithmetic.  When x is infinity in sin(x), cos(x), or tan(x), or when |x| > 1 in asin(x) or acos(x), the functions return NaN values and errno is set to EDOM. 

Sun Release 3.2  —  Last change: 19 December 1985