Hi all. Thank you all. I am finally understanding this. Very interesting. I went through all the answers that was provided and tried them but i am really intrigued though by Tesla23 way of doing it using parametric plots. Will using parametric plots always provide the correct answer? I tried it out using the online mathematica and it works. it looks like a cardioid. Heart shaped. As I am a student that has no lectures(not able to consult any lecturer), so forgive me if I might not know these concepts very well.Thanks again.