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casin, casinf, casinl - complex arc sine

#include<complex.h>doublecomplexcasin(doublecomplexz);floatcomplexcasinf(floatcomplexz);longdoublecomplexcasinl(longdoublecomplexz);Link with-lm.

Thecasin() function calculates the complex arc sine ofz. Ify=casin(z), thenz=csin(y). The real part ofyis 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.

C99.

ccos(3),clog(3),complex(7)

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