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CASIN(3) Library Functions Manual CASIN(3)

casin, casinf, casinl
complex circular 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);

The casin(), casinf() and casinl() functions compute the complex circular arc sine of z.

For all complex floating-point numbers z,

casin(z) = -i clog(iz + csqrt(1 - z^2)).

The casin(), casinf() and casinl() functions return the complex circular arc sine of z with unbounded imaginary part, and real part in the interval [-Pi/2, Pi/2].

cacos(3), catan(3)

The casin(), casinf() and casinl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
June 5, 2013 OpenBSD-current