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  • $\begingroup$ Thank you. It certainly seems to be working. I just need to check this out myself. Thanks. $\endgroup$ Commented Nov 28, 2024 at 19:34
  • $\begingroup$ your code works perfectly well. One more question: This equation is a 4th order equation with respect to n1 and has four solutions. You provided one solution. How can I find the rest? $\endgroup$ Commented Nov 28, 2024 at 20:05
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    $\begingroup$ @neutrino updated for all 4 solutions $\endgroup$ Commented Nov 28, 2024 at 20:28
  • $\begingroup$ This is exactly what I need. Thank you! $\endgroup$ Commented Nov 28, 2024 at 21:10