Lines Matching defs:tanh

33 static char sccsid[] = "@(#)tanh.c	8.1 (Berkeley) 6/4/93";
51  *	1. reduce x to non-negative by tanh(-x) = - tanh(x).
53  *	    0      <  x <=  1.e-10 :  tanh(x) := x
55  *	    1.e-10 <  x <=  1      :  tanh(x) := --------------
58  *	    1      <= x <=  22.0   :  tanh(x) := 1 -  ---------------
60  *	    22.0   <  x <= INF     :  tanh(x) := 1.
65  *	tanh(NaN) is NaN;
66  *	only tanh(0)=0 is exact for finite argument.
69  *	tanh(x) returns the exact hyperbolic tangent of x nearly rounded.
77 tanh(double x)
104 	return tanh(x);