NAME

sin, sind, cos, cosd, tan, tand, cot, cotd, asin, asind, acos, acosd, atan, atand, atan2, atand2, sincos, sincosd − Trigonometric and inverse trigonometric functions in radian and degree calculations. 

LIBRARY

Math Library (libm.a)

SYNOPSIS

#include <math.h>

double sin      (double x);
float  sinf     (float  x);
double sind     (double x);
float  sindf    (float  x);
double cos      (double x);
float  cosf     (float  x);
double cosd     (double x);
float  cosdf    (float  x);
double tan      (double x);
float  tanf     (float  x);
double tand     (double x);
float  tandf    (float  x);
double cot      (double x);
float  cotf     (float  x);
double cotd     (double x);
float  cotdf    (float  x);
double asin     (double x);
float  asinf    (float  x);
double asind    (double x);
float  asindf   (float  x);
double acos     (double x);
float  acosf    (float  x);
double acosd    (double x);
float  acosdf   (float  x);
double atan     (double x);
float  atanf    (float  x);
double atand    (double x);
float  atandf   (float  x);
double atan2    (double y, double x);
float  atan2f   (float  y, float  x);
double atand2   (double y, double x);
float  atand2f  (float  y, float  x);
double_complex  sincos   (double x);
float_complex   sincosf  (float  x);
double_complex  sincosd  (double x);
float_complex   sincosdf (float  x);

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

acos():  XPG4

asin():  XPG4

atan():  XPG4

atan2():  XPG4

cos():  XPG4

sin():  XPG4

tan():  XPG4

Refer to the standards(5) reference page for more information about industry standards and associated tags. 

DESCRIPTION

The sin() and sinf() functions compute the sine of x, measured in radians. 

The sind() and sindf() functions compute the sine of x, measured in degrees. 

The cos() and cosf() functions compute the cosine of x, measured in radians. 

The cosd() and cosdf() functions compute the cosine of x, measured in degrees. 

The tan() and tanf() functions compute the tangent of x, measured in radians. 

The tand() and tandf() functions compute the tangent of x, measured in degrees. 

The cot() and cotf() functions compute the cotangent of x, measured in radians. 

The cotd() and cotdf() functions compute the cotangent of x, measured in degrees. 

The asin() and asinf() functions compute the principal value of the arc sine of x in the interval [−pi/2,pi/2] radians. The value of x must be in the domain [−1,1]. 

The asind() and asindf() functions compute the principal value of the arc sine of x in the interval [−90,90] degrees. The value of x must be in the domain [−1,1]. 

The acos() and acosf() functions compute the principal value of the arc cosine of x in the interval [0,pi] radians. The value of x must be in the domain [−1,1]. 

The acosd() and acosdf() functions compute the principal value of the arc cosine of x in the interval [0,180] degrees. The value of x must be in the domain [−1,1]. 

The atan() and atanf() functions compute the principal value of the arc tangent of x in the interval [−pi/2,pi/2] radians. 

The atand() and atandf() functions compute the principal value of the arc tangent of x in the interval [−90,90] degrees. 

The atan2() and atan2f() functions compute the principal value of the arc tangent of y/x, in the interval [−pi,pi] radians.  The sign of atan2() and atan2f() is determined by the sign of y.  The value of atan2(y,x) is computed as follows where f is the number of fraction bits associated with the data type. 

The atand2() and atand2f() functions compute the principal value of the arc tangent of y/x in the interval [−180,180] degrees.  The sign of atand2() and atand2f() is determined by the sign of y. 

The sincos() and sincosf() functions compute the sine and cosine of x, measured in radians. 

The sincosd() and sincosdf() functions compute the sine and cosine of x, measured in degrees. 

Double_complex and float_complex data types can be used only by languages that support them. 

The following table describes function behavior in response to exceptional arguments:

The following table lists boundary values used by these functions: