Code Standard standard:
Use the structure of an expression to identify ways to rewrite it. Extend polynomial expressions to multivariable expressions. Focus on rational or exponential expressions seeing that (x2 + 4)/(x2 + 3) as ( (x2+3) + 1 )/(x2+3), thus recognizing an opportunity to write it as 1 + 1/(x2 + 3).
Code Standard Conceptual Category: