whole_func_string: function(expr, context, subIntegral) {
        var simplified = simplify.simplifyCore(expr, context);
        if(!simplified.equals(expr)) {
          return subIntegral(simplified, context, "simplified expression");
        }
      }
func_code_string: function(expr, context, subIntegral) {
        var simplified = simplify.simplifyCore(expr, context);
        if(!simplified.equals(expr)) {
          return subIntegral(simplified, context, "simplified expression");
        }
      }
func_documentation_string: Simplify constants in the integral