Added chapter of list of routines provided by libm.

doc/posix_users/libm.t

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+@c
+@c COPYRIGHT (c) 1988-1999.
+@c On-Line Applications Research Corporation (OAR).
+@c All rights reserved.
+@c
+@c $Id$
+@c
+
+@chapter Services Provided by the Math Library (libm)
+
+@section Introduction
+
+This section lists the routines that provided by the Newlib Math Library
+(libm).
+
+@section Standard Math Functions (math.h)
+
+@itemize @bullet
+@item acos - Arccosine 
+@item acosh - Inverse hyperbolic cosine 
+@item asin - Arcsine 
+@item asinh - Inverse hyperbolic sine 
+@item atan - Arctangent 
+@item atan2 - Arctangent of y/x 
+@item atanh - Inverse hyperbolic tangent 
+@item jN - Bessel functions (jN and yN) 
+@item cbrt - Cube root 
+@item copysign - Sign of Y and magnitude of X 
+@item cosh - Hyperbolic cosine 
+@item erf - Error function (erf and erfc) 
+@item exp - Exponential 
+@item expm1 - Exponential of x and - 1 
+@item fabs - Absolute value (magnitude) 
+@item floor - Floor and ceiling (floor and ceil) 
+@item fmod - Floating-point remainder (modulo) 
+@item frexp - Split floating-point number 
+@item gamma - Logarithmic gamma function 
+@item hypot - Distance from origin 
+@item ilogb - Get exponent 
+@item infinity - Floating infinity 
+@item isnan - Check type of number 
+@item ldexp - Load exponent 
+@item log - Natural logarithms 
+@item log10 - Base 10 logarithms 
+@item log1p - Log of 1 + X 
+@item matherr - Modifiable math error handler 
+@item modf - Split fractional and integer parts 
+@item nan - Floating Not a Number 
+@item nextafter - Get next representable number 
+@item pow - X to the power Y 
+@item remainder - remainder of X divided by Y 
+@item scalbn - scalbn 
+@item sin - Sine or cosine (sin and cos) 
+@item sinh - Hyperbolic sine 
+@item sqrt - Positive square root 
+@item tan - Tangent 
+@item tanh - Hyperbolic tangent 
+@end itemize