double
     tanh(double x);

     long double
     tanhl(long double x);

     float
     tanhf(float x);

DESCRIPTION

     The tanh() function computes the hyperbolic tangent of x.

SPECIAL VALUES

     tanh(+-0) returns +-0.

     tanh(+-infinity) returns +-1.

SEE ALSO

     acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), sin(3), sinh(3),
     tan(3), math(3)

STANDARDS

     The tanh() function conforms to ISO/IEC 9899:1999(E).

BSD                            November 20, 2002                           BSD