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man page for csqrt

CSQRT(3)						     Linux Programmer's Manual							  CSQRT(3)

NAME
csqrt, csqrtf, csqrtl - complex square root SYNOPSIS
#include <complex.h> double complex csqrt(double complex z); float complex csqrtf(float complex z); long double complex csqrtl(long double complex z); Link with -lm. DESCRIPTION
These functions calculate the complex square root of z, with a branch cut along the negative real axis. (That means that csqrt(-1+eps*I) will be close to I while csqrt(-1-eps*I) will be close to -I, if eps is a small positive real number.) VERSIONS
These functions first appeared in glibc in version 2.1. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------------------------+---------------+---------+ |Interface | Attribute | Value | +----------------------------+---------------+---------+ |csqrt(), csqrtf(), csqrtl() | Thread safety | MT-Safe | +----------------------------+---------------+---------+ CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008. SEE ALSO
cabs(3), cexp(3), complex(7) 2017-09-15 CSQRT(3)

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