\theta_n=(x_n^2+y_n^2)-2.0
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  1. http://formula.s21g.com/?%5Ctheta_n%3D(x_n%5E2+y_n%5E2)-2.0
  2. http://chaoscloud950.blog60.fc2.com/page-3.html
  3. http://chaoscloud950.blog60.fc2.com/category1-1.html
  4. http://chaoscloud950.blog60.fc2.com/category0-1.html