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Taylor's Theorem For Power Series

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Taylor's Theorem For Power Series  :   Statement :           Let          ∞                                                               Σ aₙ xⁿ be a power series with                     n= 0  radius of convergence R , and let                       ∞            f(x) = Σ aₙ xⁿ  , |x| < R                      n=0 Then for any a∈ ]-R ,R[ , prove that f can be expanded in a power series about 'a' which converges for  |x-a| < R- |a| , and                ∞     f(x) = Σ...