> ## 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