Homework Statement
f(x) = \sum \frac{9^{n}}{4n} x^{2n}
n=1, \infty is on top of the summation sign.Homework Equations
a) Use the Ratio Test to find the radius of convergence of the Power Series
b) Find f \grave{}(x) and write out the first three (non-zero) terms of the power series for f...