# Trigonometric Functions

The Intel Math library supports the following trigonometric functions:

## ACOS

Description: The acos function returns the principal value of the inverse cosine of x in the range [0, pi] radians for x in the interval [-1,1].

errno: EDOM, for |x| > 1

Calling interface:
double acos(double x);
long double acosl(long double x);
float acosf(float x);

## ACOSD

Description: The acosd function returns the principal value of the inverse cosine of x in the range [0,180] degrees for x in the interval [-1,1].

errno: EDOM, for |x| > 1

Calling interface:
double acosd(double x);
long double acosdl(long double x);
float acosdf(float x);

## ASIN

Description: The asin function returns the principal value of the inverse sine of x in the range [-pi/2, +pi/2] radians for x in the interval [-1,1].

errno: EDOM, for |x| > 1

Calling interface:
double asin(double x);
long double asinl(long double x);
float asinf(float x);

## ASIND

Description: The asind function returns the principal value of the inverse sine of x in the range [-90,90] degrees for x in the interval [-1,1].

errno: EDOM, for |x| > 1

Calling interface:
double asind(double x);
long double asindl(long double x);
float asindf(float x);

## ATAN

Description: The atan function returns the principal value of the inverse tangent of x in the range [-pi/2, +pi/2] radians.

Calling interface:
double atan(double x);
long double atanl(long double x);
float atanf(float x);

## ATAN2

Description: The atan2 function returns the principal value of the inverse tangent of y/x in the range [-pi, +pi] radians.

errno: EDOM, for x = 0 and y = 0

Calling interface:
double atan2(double y, double x);
long double atan2l(long double y, long double x);
float atan2f(float y, float x);

## ATAND

Description: The atand function returns the principal value of the inverse tangent of x in the range [-90,90] degrees.

Calling interface:
double atand(double x);
long double atandl(long double x);
float atandf(float x);

## ATAN2D

Description: The atan2d function returns the principal value of the inverse tangent of y/x in the range [-180, +180] degrees.

errno: EDOM, for x = 0 and y = 0.

Calling interface:
double atan2d(double x, double y);
long double atan2dl(long double x, long double y);
float atan2df(float x, float y);

## COS

Description: The cos function returns the cosine of x measured in radians. This function may be inlined with the Itanium® compiler.

Calling interface:
double cos(double x);
long double cosl(long double x);
float cosf(float x);

## COSD

Description: The cosd function returns the cosine of x measured in degrees.

Calling interface:
double cosd(double x);
long double cosdl(long double x);
float cosdf(float x);

## COT

Description: The cot function returns the cotangent of x measured in radians.

errno: ERANGE, for overflow conditions at x = 0.

Calling interface:
double cot(double x);
long double cotl(long double x);
float cotf(float x);

## COTD

Description: The cotd function returns the cotangent of x measured in degrees.

errno: ERANGE, for overflow conditions at x = 0.

Calling interface:
double cotd(double x);
long double cotdl(long double x);
float cotdf(float x);

## SIN

Description: The sin function returns the sine of x measured in radians. This function may be inlined with the Itanium® compiler.

Calling interface:
double sin(double x);
long double sinl(long double x);
float sinf(float x);

## SINCOS

Description: The sincos function returns both the sine and cosine of x measured in radians. This function may be inlined with the Itanium® compiler.

Calling interface:
void sincos(double x, double *sinval, double *cosval);
void sincosl(long double x, long double *sinval, long double *cosval);
void sincosf(float x, float *sinval, float *cosval);

## SINCOSD

Description: The sincosd function returns both the sine and cosine of x measured in degrees.

Calling interface:
void sincosd(double x, double *sinval, double *cosval);
void sincosdl(long double x, long double *sinval, long double *cosval);
void sincosdf(float x, float *sinval, float *cosval);

## SIND

Description: The sind function computes the sine of x measured in degrees.

Calling interface:
double sind(double x);
long double sindl(long double x);
float sindf(float x);

## TAN

Description: The tan function returns the tangent of x measured in radians.

Calling interface:
double tan(double x);
long double tanl(long double x);
float tanf(float x);

## TAND

Description: The tand function returns the tangent of x measured in degrees.

errno: ERANGE, for overflow conditions

Calling interface:
double tand(double x);
long double tandl(long double x);
float tandf(float x);