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sin

Sine function

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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

(1)

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

Example 1:

#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;
}

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		•			•

Last Modified: 2009-11-01 08:43:09 Page Rendered: 2010-03-15 00:53:16

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sin