casin, casinf, casinl − complex arc sine
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.
For an explanation of the terms used in this section, see attributes(7).
clog(3), csin(3), complex(7)
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