In: Advanced Math
Consider the power seriesf(z) =∑∞k=0akzkwhereak=(2k,keven,17kkodd.
(a)Show that neither limn→∞an+1annor limn→∞|an|1nexist.
(b)Find the radius of convergence of each power series:f1(z) =∞∑m=022mz2mandf2(z) =∞∑m=0z2m+172m+1.
(c)Verify thatf(z) =f1(z) +f2(z). Use the radii of convergence off1(z)andf2(z)to infer theradius of convergence off(z)