The new System.MathF APIs (#1151) where implemented in dotnet/coreclr#5492. However, they are currently only available in netcoreapp1.1 base applications.

Until they make their way back into the Desktop framework, I propose that simple wrapper implementations be provided so the APIs are accessible in .NETStandard based libraries.

The wrapper function should just call the corresponding System.Math API and cast the result back to System.Single.

For example, System.Acos(float) would be implemented as:

namespace System
{
    public static class MathF
    {
        public static float Acos(float value)
        {
            return (float)Math.Acos(value);
        }
    }
}