You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hyperdual_fike.go
    path of file: ./repos/gonum/num/hyperdual
    
    the code of the file until where you have to start completion: // Copyright ©2018 The Gonum Authors. All right
    
func Asin(d Number) Number {
	if d.Real == 0 {
		return Number{
			Real:    d.Real,
			E1mag:   d.E1mag,
			E2mag:   d.E2mag,
			E1E2mag: d.Real,
		}
	} else if m := math.Abs(d.Real); m >= 1 {
		if m == 1 {
			return Number{
				Real:    math.Asin(d.Real),
				E1mag:   math.Inf(1),
				E2mag:   math.Inf(1),
				E1E2mag: math.Copysign(math.Inf(1), d.Real),
			}
		}
		return Number{
			Real:    math.NaN(),
			E1mag:   math.NaN(),
			E2mag:   math.NaN(),
			E1E2mag: math.NaN(),
		}
	}
	fn := math.Asin(d.Real)
	deriv1 := 1 - d.Real*d.Real
	deriv := 1 / math.Sqrt(deriv1)
	return Number{
		Real:    fn,
		E1mag:   deriv * d.E1mag,
		E2mag:   deriv * d.E2mag,
		E1E2mag: deriv*d.E1E2mag + d.E1mag*d.E2mag*(d.Real*math.Pow(deriv1, -1.5)),
	}
}