UnityEngine.Mathf.Asin C# (CSharp) Method

        public static float Asin(float f)
        {
            return (float)Math.Asin(f);
        }

 Euler4 ToEulerInHalfSingularity()
 {
     if (ex.x < 0)
     {
         // 90 deg of X, U, V
     }
     else if (ey.y < 0)
     {
         if (ez.z < 0)
         {
             return(new Euler4(0, Utility.Atan2(ey.z, ey.y) * Math.Rad2Deg));          // X
         }
         if (ew.w < 0)
         {
             return(new Euler4(4, Utility.Atan2(ew.y, ey.y) * Math.Rad2Deg));          // U
         }
     }
     else if (ez.z < 0 && ew.w < 0)
     {
         return(new Euler4(5, Utility.Atan2(ew.z, ez.z) * Math.Rad2Deg)); // V
     }
     // (all diag is positive)
     return(new Euler4(Math.Asin(ey.z), Math.Asin(ez.x), Math.Asin(ex.y),
                       Math.Asin(ew.x), Math.Asin(ew.y), Math.Asin(ew.z)) * Math.Rad2Deg);
 }