How to show e^iθ = cos θ + i sin θ using Standard Series

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This is a question from the Singapore A-Level H2 Mathematics syllabus.

Topic: Maclaurin and Power Series

  1. Tim Gan Math - A Level H2 Mathematics
  2. H2 Math
  3. A Level Math
  4. Singapore Math
  5. Junior College Mathematics
  6. GCE A Level
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3:07 hello hello, here i dont understand why u wrote it + while it was - up there, i rewatched the scene many times but my english is not that perfect to understand u, can u explain pls ? And thanks for the video

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