Find the Maclaurin series for the function $\tan^{-1}(2x^2)$
Express your answer in sigma notation, simplified as much as possible. What is the open interval of convergence of the series.
I have the correct answer, but I would like to use another method to solve this.
By taking the function and its derivative, find the sum and then taking the anti derivative. This does not yield the same answer for me.