Solution - Simplification or other simple results

Step  1  :

            xy
 Simplify   ——
            2 

Equation at the end of step  1  :

   d        xy
  —— • (4 • ——)
  dx        2 

Step  2  :

             d
 Simplify   ——
            dx

Canceling Out :

 2.1    Canceling out d as it appears on both sides of the fraction line

Equation at the end of step  2  :

  1
  — • 2xy
  x

Step  3  :

Canceling Out :

 3.1    Canceling out x as it appears on both sides of the fraction line

Final result :

  2y