Question: How to plot -diff(theta(eta), eta) VS Bi? I can only get  -diff(theta(eta), eta) VS eta. I am confused.​​​​​​​

This is the graph I want but Nb must be equal to Nt. I should get values -diff(theta(eta), eta) for Bi or Nt Nb first?

BiNbNtxx.mw

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