SuSE 11.3 - man page for casinf (suse section 3)
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CASIN(3) Linux Programmer's Manual CASIN(3)
casin, casinf, casinl - complex arc sine
double complex casin(double complex z);
float complex casinf(float complex z);
long double complex casinl(long double complex z);
Link with -lm.
The casin() function calculates 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].
casin(z) = -i clog(iz + csqrt(1 - z * z))
These functions first appeared in glibc in version 2.1.
ccos(3), clog(3), complex(7)
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