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I have created five lines in a plot.

Plot[Table[1 + (k - 1)*Sin[theta]^2, {k, 0, 2, 0.5}], {theta, 0, 
Pi/2}, PlotRange -> {{0, Pi/2}, {0, 2}}]

And I want to add five labels for them each other.I used PlotLabels \ such as this :

PlotLabels -> {"a=0", "a=0.5", "a=1.0", "a=1.5", "a=2.0"}

But I get a picture with only one label. I want to get fives of each other.

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Plot[Evaluate@Table[1 + (k - 1)*Sin[theta]^2, {k, 0, 2, 0.5}], {theta, 0, Pi/2}, 
PlotRange -> {{0, Pi/2}, {0, 2}}, PlotLabels -> {"a=0", "a=0.5", "a=1.0", "a=1.5", "a=2.0"}]

enter image description here

In response to your comment,

Plot[Evaluate@Table[1 + (k - 1)*Sin[theta]^2, {k, 0, 2, 0.5}], {theta,
   0, Pi/2}, PlotRange -> {{0, Pi/2}, {0, 2}}, 
 PlotLabels -> {Subscript["I", 3]/Subscript["I", 1] == 0, "a=0.5", 
   "a=1.0", "a=1.5", "a=2.0"}]

enter image description here

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  • $\begingroup$ That is great. But when I change "a" to "Subscript[I, 3]/Subscript[I, 1]", it does not work. How can I solve it? $\endgroup$ – ch li Mar 16 at 14:03

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