Question Number 55066 by gunawan last updated on 17/Feb/19
$$\mathrm{Find}\:\mathrm{radius}\:\mathrm{convergence}\:\mathrm{for}\:\mathrm{series} \\ $$$$\mathrm{1}−{z}^{\mathrm{2}} +{z}^{\mathrm{4}} −{z}^{\mathrm{6}} +… \\ $$
Find-radius-convergence-for-series-1-z-2-z-4-z-6-