casin(3) Library Functions Manual casin(3) casin, casinf, casinl - (libm -lm) #include double complex casin(double complex z); float complex casinf(float complex z); long double complex casinl(long double complex z); z. y = casin(z) z = csin(y). y [-pi/2,pi/2]. : casin(z) = -i clog(iz + csqrt(1 - z * z)) attributes(7). +------------+------------------------------------+--------------------+ || | | +------------+------------------------------------+--------------------+ |casin(), | | MT-Safe | |casinf(), | | | |casinl() | | | +------------+------------------------------------+--------------------+ C11, POSIX.1-2008. glibc 2.1. C99 POSIX.1-2001. clog(3), csin(3), complex(7) 3 . . : . 6.18 8 2026 casin(3)