C in a Nutshell

Name

casin

Synopsis

Calculates the inverse sine of a complex number

#include <complex.h>
double complexcasin( double complex z );
float complex casinf( float complex z );
long double complex casinl( long double complex z );

The casin() functions accept a complex number as their argument and return a complex number, but otherwise work the same as asin(). The real part of the return value is in the interval [-π/2, π/2].

Example

puts("Results of the casin() function for integer values:");
float complex z = 0;
for ( int n = -3;  n <= 3;  ++n)
{
  z = casinf(n);
  printf("  casin(%+d) = %+.2f %+.2f*I\n", n, crealf(z), cimagf(z) );
}

This code produces the following output:

Results of the casin() function for integer values:
  casin(-3) = -1.57 +1.76*I
  casin(-2) = -1.57 +1.32*I
  casin(-1) = -1.57 -0.00*I
  casin(+0) = +0.00 +0.00*I
  casin(+1) = +1.57 -0.00*I
  casin(+2) = +1.57 +1.32*I
  casin(+3) = +1.57 +1.76*I

See Also

ccos(), csin(), ctan(), cacos(), casin(), catan()