x=x_i
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Recent Referers:
  1. http://formula.s21g.com/?x%3Dx_i
  2. https://formula.s21g.com/formulae/25032
  3. https://aaaazzzz036.hatenablog.com/entry/2013/05/06/12123...
  4. https://aaaazzzz036.hatenablog.com/entry/2013/05/06/121233
  5. https://aaaazzzz036.hatenablog.com/