SIN(3) | Library Functions Manual | SIN(3)

# NAME

`sin`, `sinf`, `sinl` — sine functions

# SYNOPSIS

Math Library (libm, -lm)
`#include <math.h>`

double
`sin`(double x);

float
`sinf`(float x);

long double
`sinl`(long double x);

# DESCRIPTION

The `sin`() function computes the sine of x (measured in radians). The `sinf`() function is a single precision version of `sin`(). The `sinl`() function is an extended precision version of `sin`(). A large magnitude argument may yield a result with little or no significance.

# RETURN VALUES

The `sin`(), `sinf`() and `sinl`() functions return the sine value.

# SEE ALSO

acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), sinh(3), tan(3), tanh(3)

# STANDARDS

The `sin`() function conforms to ANSI X3.159-1989 (“ANSI C89”).

# HISTORY

A `sin`() function first appeared in Version 1 AT&T UNIX.

June 7, 2025 | Debian