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+'\" t
+.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
+.\"
+.\" SPDX-License-Identifier: GPL-1.0-or-later
+.\"
+.TH csqrt 3 2024-05-02 "Linux man-pages (unreleased)"
+.SH NAME
+csqrt, csqrtf, csqrtl \- complex square root
+.SH LIBRARY
+Math library
+.RI ( libm ", " \-lm )
+.SH SYNOPSIS
+.nf
+.B #include <complex.h>
+.P
+.BI "double complex csqrt(double complex " z );
+.BI "float complex csqrtf(float complex " z );
+.BI "long double complex csqrtl(long double complex " z );
+.fi
+.SH DESCRIPTION
+These functions calculate the complex square root of
+.IR z ,
+with a branch cut along the negative real axis.
+(That means that \fIcsqrt(\-1+eps*I)\fP will be close to I while
+\fIcsqrt(\-1\-eps*I)\fP will be close to \-I, \fIif eps\fP is a small positive
+real number.)
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR csqrt (),
+.BR csqrtf (),
+.BR csqrtl ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+glibc 2.1.
+C99, POSIX.1-2001.
+.SH SEE ALSO
+.BR cabs (3),
+.BR cexp (3),
+.BR complex (7)