Find the radius of convergence in two ways: (a) Directly by the CauchyHadamard formula in Sec. 15.2.

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Find the radius of convergence in two ways:

(a) Directly by the Cauchy–Hadamard formula in Sec. 15.2.

(b) From a series of simpler terms by using Theorem 3 or Theorem 4.

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