Manpages - casin.3

casin, casinf, casinl - complex arc sine

  #include <complex.h>

  double complex casin(double complex z);
  float complex casinf(float complex z);
  long double complex casinl(long double complex z);

  Link with -lm.

These functions calculate the complex arc sine of z. If y = casin(z), then z = csin(y). The real part of y is chosen in the interval [-pi/2,pi/2].

One has:

      casin(z) = -i clog(iz + csqrt(1 - z * z))

These functions first appeared in glibc in version 2.1.

For an explanation of the terms used in this section, see *attributes*(7).

C99, POSIX.1-2001, POSIX.1-2008.

*clog*(3), *csin*(3), *complex*(7)

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