Find the MacLaurin series and its interval of convergence. 
Definitions:
20th Century
The period from January 1, 1901, to December 31, 2000, characterized by significant global changes including technological advances, wars, and cultural shifts.
Uncontrolled Case Study
A descriptive, exploratory analysis of a single individual or group without the use of a comparison or control group.
Individual Subjects
Participants in a study viewed as separate entities, each providing unique data or insights.
Empirical-Based Practice
A decision-making process that integrates the best available research with clinical expertise and patient values.
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