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Important Expansions

  1. (1 + x)–1 = 1 – x + x2x3 + ... + (–1)r xr + ...
  2. (1 – x)–1 = 1 + x + x2 + x3 + ... + xr + ...
  3. (1 + x)–2 = 1 – 2x + 3x2 – 4x3 + ...
  4. (1 – x)–2 = 1 + 2x + 3x2 + 4x3 + ...




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