> # NAME

> tanh - returns hyperbolic tangent of scalars and vectors.

> # SYNOPSIS

>       float  tanh( float  a );
>       float1 tanh( float1 a );
>       float2 tanh( float2 a );
>       float3 tanh( float3 a );
>       float4 tanh( float4 a );

>       half   tanh( half  a );
>       half1  tanh( half1 a );
>       half2  tanh( half2 a );
>       half3  tanh( half3 a );
>       half4  tanh( half4 a );

>       fixed  tanh( fixed  a );
>       fixed1 tanh( fixed1 a );
>       fixed2 tanh( fixed2 a );
>       fixed3 tanh( fixed3 a );
>       fixed4 tanh( fixed4 a );

> # PARAMETERS

> a

>   Vector or scalar of which to determine the hyperbolic tangent.

> # DESCRIPTION

> Returns the hyperbolic tangent of a.

> For vectors, the returned vector contains the hyperbolic tangent of each element of the input vector.

> # REFERENCE IMPLEMENTATION

> tanh for a scalar float could be implemented like this.

>       float tanh(float x)
>       {
>         float exp2x = exp(2*x);
>         return (exp2x - 1) / (exp2x + 1);
>       }

> # PROFILE SUPPORT

> tanh is supported in all profiles except fp20.

> # SEE ALSO

> atan, atan2, cosh, exp, sinh, tan