diff --git a/doc/examples/use-case-8.b b/doc/examples/use-case-8.b
index ee36fd6..d2c17c6 100644
--- a/doc/examples/use-case-8.b
+++ b/doc/examples/use-case-8.b
@@ -1,2 +1,6 @@
-fun f = f(3) * x * 4 + 3;
-fun g =  f(3) + f'(3)*(x-3) + f''(3)/2 * (x-3)^2 + f'''(3) / 6 * (x-3)^3 + f''''(3) / 24 * (x-3)^4;
\ No newline at end of file
+fun f = x^2;
+fun g = derivative f in (x);
+fun h = f(x) - int f (0 ~ 1);
+for (var i = 0; i <= 1; i += 0.1) {
+    print(g(i));
+}
\ No newline at end of file