cdots math written compact sigma notation math sum n infty frac f n n x n math ''n'' denotes factorial ''n'' '' '' sup nbsp ''n'' sup ''a'' denotes ''n''th derivative '' '' evaluated point ''a'' derivative order zero '' '' defined '' '' defined nbsp case series also called maclaurin series taylor series ''f'' point ''a'' may diverge converge point ''a'' converge ''x'' math x r math
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