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+.\" Copyright (c) 1985, 1991 Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)exp.3	6.12 (Berkeley) 7/31/91
+.\" $FreeBSD: src/lib/msun/man/exp.3,v 1.24 2008/01/18 21:43:00 das Exp $
+.\"	$NetBSD: exp.3,v 1.33 2024/01/26 19:27:30 nros Exp $
+.\"
+.Dd January 24, 2024
+.Dt EXP 3
+.Os
+.Sh NAME
+.Nm exp ,
+.Nm expf ,
+.Nm expl ,
+.\" The sorting error is intentional.  exp and expf should be adjacent.
+.Nm exp2 ,
+.Nm exp2f ,
+.Nm exp2l ,
+.Nm expm1 ,
+.Nm expm1f
+.Nm expm1l
+.Nd exponential functions
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In math.h
+.Ft double
+.Fn exp "double x"
+.Ft float
+.Fn expf "float x"
+.Ft long double
+.Fn expf "long double x"
+.Ft double
+.Fn exp2 "double x"
+.Ft float
+.Fn exp2f "float x"
+.Ft long double
+.Fn exp2l "long double x"
+.Ft double
+.Fn expm1 "double x"
+.Ft float
+.Fn expm1f "float x"
+.Ft long double
+.Fn expm1l "long double x"
+.Sh DESCRIPTION
+The
+.Fn exp ,
+.Fn expf ,
+and
+.Fn expl
+functions compute the base
+.Ms e
+exponential value of the given argument
+.Fa x .
+.Pp
+The
+.Fn exp2 ,
+.Fn exp2f ,
+and
+.Fn exp2l
+functions compute the base 2 exponential of the given argument
+.Fa x .
+.Pp
+The
+.Fn expm1 ,
+.Fn expm1f
+and
+.Fn expm1l
+functions compute the value exp(x)\-1 accurately even for tiny argument
+.Fa x .
+.Sh RETURN VALUES
+These functions will return the appropriate computation unless an error
+occurs or an argument is out of range.
+The functions
+.Fn exp
+and
+.Fn expm1
+detect if the computed value will overflow,
+set the global variable
+.Va errno
+to
+.Er ERANGE
+and cause a reserved operand fault on a
+.Tn VAX .
+.Sh SEE ALSO
+.Xr math 3
+.Sh STANDARDS
+The
+.Fn exp
+function conforms to
+.St -ansiC .
+The
+.Fn exp2 ,
+.Fn exp2f ,
+.Fn exp2l ,
+.Fn expf ,
+.Fn expl ,
+.Fn expm1 ,
+.Fn expm1f ,
+and
+.Fn expm1l
+functions conform to
+.St -isoC-99 .
+.Sh HISTORY
+The
+.Fn exp
+functions appeared in
+.At v1 .
+The
+.Fn expm1
+function appeared in
+.Bx 4.3 .