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`tanh', `tanhf'--hyperbolic tangent

     #include <math.h>
     double tanh(double X);
     float tanhf(float X);
`tanh' computes the hyperbolic tangent of the argument X.  Angles are
specified in radians.
   `tanh(X)' is defined as
   `tanhf' is identical, save that it takes and returns `float' values.
The hyperbolic tangent of X is returned.
`tanh' is ANSI C.  `tanhf' is an extension.