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Jun 25th, 2017
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  1. (%i1) a : c / (1 - e^2);
  2. c
  3. (%o1) ------
  4. 2
  5. 1 - e
  6. (%i2) b : c / sqrt(1 - e^2);
  7. c
  8. (%o2) ------------
  9. 2
  10. sqrt(1 - e )
  11. (%i3) d : a * e;
  12. c e
  13. (%o3) ------
  14. 2
  15. 1 - e
  16. (%i4) r : c / (1 + e * cos(t));
  17. c
  18. (%o4) ------------
  19. e cos(t) + 1
  20. (%i5) x : d + r * cos(t);
  21. c cos(t) c e
  22. (%o5) ------------ + ------
  23. e cos(t) + 1 2
  24. 1 - e
  25. (%i6) y : r * sin(t);
  26. c sin(t)
  27. (%o6) ------------
  28. e cos(t) + 1
  29. (%i7) trigsimp(x^2/a^2 + y^2/b^2);
  30. (%o7) 1
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