# csinf, csin, csinl

< c‎ | numeric‎ | complex
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Complex number arithmetic
Types and the imaginary constant
Manipulation
Power and exponential functions
Trigonometric functions
 ccos csin ctan
Hyperbolic functions

 Defined in header `` float complex       csinf( float complex z ); (since C99) double complex      csin( double complex z ); (since C99) long double complex csinl( long double complex z ); (since C99)

Computes the complex sine of `z`.

## Contents

### Parameters

 z - complex argument

### Return value

The complex sine of `z`.

### Example

```#include <stdio.h>
#include <complex.h>
#include <math.h>

#define PI acos(-1)

int main()
{
double complex z;
double x;

/* Print familiar values. */
int ndx;
printf("            sin(x)          csin(z)\n");
printf("           --------    ------------------\n");
for (ndx=0;ndx<9;ndx++) {
x = ndx*0.25*PI;
z = x+0.0*I;
z = csin(z);
printf("%.2f*PI   %9f   %9f%+fi\n", ndx*0.25,sin(x),creal(z),cimag(z));
}

return 0;
}```

Output:

```sin(x)          csin(z)
--------    ------------------
0.00*PI    0.000000    0.000000+0.000000i
0.25*PI    0.707107    0.707107+0.000000i
0.50*PI    1.000000    1.000000+0.000000i
0.75*PI    0.707107    0.707107-0.000000i
1.00*PI    0.000000    0.000000-0.000000i
1.25*PI   -0.707107   -0.707107-0.000000i
1.50*PI   -1.000000   -1.000000-0.000000i
1.75*PI   -0.707107   -0.707107+0.000000i
2.00*PI   -0.000000   -0.000000+0.000000i```