@Kitonum Thanks a lot, I really appreciate. 

@Markiyan Hirnyk 

Thanks i have try this before , want to know if it can show Hints or Rule, as it does for 

>with(Student[Calculus1]):

>infolevel[Student[Calculus1]] := 5:

Thank you very much.

@ThU ok thank you very much all .

thank you very much i do appreciate your assistant and effort. i did that just want to clear my curiocity and doubt about it.

thank you very much i do appreciate your assistant and effort. i did that just want to clear my curiocity and doubt about it.

i really appreciate all your effort friends, and you have make my day. thank you very much Mr/Mrs/Miss Markiyan Hirnyk    and All the rest of you.

i really appreciate all your effort friends, and you have make my day. thank you very much Mr/Mrs/Miss Markiyan Hirnyk    and All the rest of you.

V vs r , take 0‹r‹5, it consider to be potential graph.