http://www.eden.rutgers.edu/~cjjacob/images/arctan.gif [Broken] I was given this problem yesterday. It's asking me to differentiate a function containing arctan. Should I find a common denominator and combine them into one term, should I just differentiate each term separately? Please I need help with this thing! I've been told it comes out to 0 but I'm not sure if he is correct or not. Thanks for replying if you choose to!