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I tried plotting the function shown below in Mathematica; however the plot showed nothing. Could you help me explain it?

Note that here D' = 1- x.

enter image description here

ClearAll[a, x]; 
parameters = {0, 0.01, 0.02, 0.05, 0.1}; 
Plot[(1/((1 - x)*(1 + a/(1 - x)^2))) /@ parameters, {x, 0, 1}, 
  PlotRange -> {{0, 1}, {0, 5}}]

enter image description here

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There are a number of ways to do this, e.g.:

f[a_, x_] := 1/((1 - x) (1 + a/(1 - x)^2))
parameters = {0, 0.01, 0.02, 0.05, 0.1};
Plot[Evaluate[f[#, x] & /@ parameters], {x, 0, 1}, 
 PlotRange -> {0, 5}, 
 PlotLegends -> 
  Table[Row[{"\!\(\*SubscriptBox[\(R\), \(L\)]\)/R=", j}], {j, 
    parameters}]]

enter image description here

or using Table: 

Plot[Evaluate[Table[f[j, x], {j, parameters}], {x, 0, 1}]]
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