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Jan 19th, 2018
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  1. logf[x_, a_, b_] := Log[a*x/(1 - b*x)]
  2.  
  3. With[{a = 1},
  4. Plot3D[logf[x, a, b], {x, 0, 1}, {b, 0, 1},
  5. ClippingStyle -> None,
  6. PlotPoints -> 100]]
  7.  
  8. D[logf[x, a, b], x] // Simplify
  9.  
  10. Plot3D[1/(x - b*x^2), {x, 0, 1}, {b, 0, 1},
  11. ClippingStyle -> None]
  12.  
  13. D[logf[x, a, b], {x, 2}] // Simplify
  14.  
  15. Plot3D[(-1 + 2*b*x)/(x^2*(-1 + b*x)^2), {x, 0, 1}, {b, 0, 1},
  16. ClippingStyle -> None,
  17. PlotPoints -> 100]
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