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Trigonometric series - Wikipedia
Trigonometric series - Encyclopedia of Mathematics
9.1: Trigonometric Series - Mathematics LibreTexts
Trigonometric Series - Cambridge University Press & Assessment
Trigonometric functions - Wikipedia
What is: Trigonometric Series - LEARN STATISTICS EASILY
Trigonometry/Power Series for Cosine and Sine - Wikibooks
Trigonometric Series -- from Wolfram MathWorld
List of trigonometric identities - Wikipedia
Expressing the Function sin x as a Series - dummies