7.3.5.2 The casin functions

Synopsis

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#include <complex.h>
double complex casin(double complex z);
float complex casinf(float complex z);
long double complex casinl(long double complex z);

Description

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The casin functions compute the complex arc sine of z, with branch cuts outside the interval [-1, +1] along the real axis.

Returns

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The casin functions return the complex arc sine value, in the range of a strip mathematically unbounded along the imaginary axis and in the interval [-pi /2, +pi /2] along the real axis.