home.md

@@ -462,7 +462,7 @@ public class DerivationDemo {
     double res=a*x*x;     // the computation can be complex,
     res = res + b*x;      // with loops, calls, recursion etc.
     res = res + 1;
-    return res;
+    return res;     // f: a X^2 + b X + 1        f': 2aX + b
   }
   public static void main(String[] args) {
     double x=2;