Originally Posted by

**snorris103** I have a problem that i can't figure out.

a.) Consider the function f(x) = 1/(1+x^2). Write this functio as power series centered at 0.

b.) Now, use the first part find a power series for g(x) = arctan(x) also centered at x.

E is a summation.

I think i have found the first part but the second part is giving me problems i came out with this answer E(-x^(2n+2))/ (2n+2) but the answer is apparently E(-x^2n)/ (2n+2)

if someone could explain to me why that would be great!!