1. The problem statement, all variables and given/known data Find T4(x), the Taylor polynomial of degree 4 of the function f(x)=arctan(11x) about x=0. (You need to enter a function.) 2. Relevant equations The taylor polynomial equation Tn(x)= f(x)+(fn(x)(x-a)^n)/n!..... 3. The attempt at a solution When I take every derivative of f(x)=arctan(11x) I always end up with an x in the numerator, so when i plug in 0 for x my derivative ends up with 0, so theoretically the answer would just be arctan(11x) which is wrong. This is what I am getting for my first few derivatives F'(x)=22x/(11x^2+1) F''(x)=-484x^2/(11x^2+1)^-2 what am i doing wrong?