> # NAME

> cosh - returns hyperbolic cosine of scalars and vectors.

> # SYNOPSIS

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

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

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

> # PARAMETERS

> a

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

> # DESCRIPTION

> Returns the hyperbolic cosine of a.

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

> # REFERENCE IMPLEMENTATION

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

>       float cosh(float x)
>       {
>         return 0.5 * (exp(x)+exp(-x));
>       }

> # PROFILE SUPPORT

> cosh is supported in all profiles except fp20.

> # SEE ALSO

> acos, cos, exp, sinh, tanh