ctanf, ctan, ctanl

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Complex number arithmetic
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 ccos csin ctan
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 Defined in header `` float complex       ctanf( float complex z ); (since C99) double complex      ctan( double complex z ); (since C99) long double complex ctanl( long double complex z ); (since C99)

Computes the complex tangent of `z`.

Contents

Parameters

 z - complex argument

Return value

The complex tangent of `z`.

Example

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

#define PI acos(-1)

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

/* Print familiar values. */
int ndx;
printf("             tan(x)             ctan(z)\n");
printf("          ------------    ----------------------\n");
for (ndx=0;ndx<9;ndx++) {
x = ndx*0.25*PI;
z = x+0.0*I;
z = ctan(z);
printf("%.2f*PI   %12g    %12g%+fi\n", ndx*0.25,tan(x),creal(z),cimag(z));
}

return 0;
}```

Output:

```tan(x)             ctan(z)
------------    ----------------------
0.00*PI              0               0+0.000000i
0.25*PI              1               1+0.000000i
0.50*PI    1.63312e+16     1.63318e+16-0.000000i
0.75*PI             -1              -1+0.000000i
1.00*PI   -1.22465e-16    -1.22461e-16+0.000000i
1.25*PI              1               1+0.000000i
1.50*PI    5.44375e+15     5.44393e+15+0.000000i
1.75*PI             -1              -1+0.000000i
2.00*PI   -2.44929e-16    -2.44921e-16+0.000000i```