1. The problem statement, all variables and given/known data Find the derivative of the following function. Simplify where possible. y=31*arctan(sqrt(x)) 2. Relevant equations I know that the derivative of arctan(x) = 1 / (1+x2) I also know we will be using chain rule and product rule. 3. The attempt at a solution y' = (31)'[arctan(sqrt(x))] + (31)[arctan(sqrt(x))]' y' = (0)[arctan(sqrt(x))] + (31)*[1/(1+x2)] * (2sqrt(x)) y' = 31 / (2sqrt(x))(1+x2) However the correct answer is y' = 31 / (2sqrt(x))(1+x) <-- no x2 I'm not sure why the x2 ends up being just x. I checked if it was simplifying problem but that wasn't it (at least not from what I see). Thanks for the help in advance.