sin

Sine function

View other versions (4)

Contents

Interface
Description
Special Values
See Also
Standards
Compatibility
Page Comments

Interface

#include <math.h>double  sin (double x)
long  sinl (long double x)
float  sinf (float x)

#include <complex.h>complex  sin (complex x)
double complex  csin (double complex x)
float complex  csinf (float complex x)
long double complex  csinl (long double complex x)

Description

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

The complex sine is defined by

$\sin(x) = \frac{\exp(i x)-\exp(-i x)}{2 i}$

(1)

Example:

Example - Sine function

Workings

#include <stdio.h>
#include <math.h>
int main(void)
{
  double x = 0.31415926;
  double result = sin(x);
  printf("The sine of %lf is %lf\n", x, result);
  return 0;
}

Solution

Output:

The sine of 0.314159 is 0.309017

Special Values

sin ( ±0 ) returns ±0.

sin ( ±∞ ) returns a NaN and raises the invalid floating-point exception.

Standards

The sin function conforms to ISO/IEC 9899:1999(E).

Compatibility

	DOS	UNIX	Windows	ANSI C	C++
sinl	•		•
Real sin	•		•	•
Complex sin	•		•		•
Complex csin		•			•

Page Comments

You must login to leave a messge

double	`sin` (double x)
long	`sinl` (long double x)
float	`sinf` (float x)

complex	`sin` (complex x)
double complex	`csin` (double complex x)
float complex	`csinf` (float complex x)
long double complex	`csinl` (long double complex x)