I just ploted y[x],y'[x] but I would like to plot other function which is g[x] based on my solution but it can't plot this ??!!

```
Clear["Global`*"]
eqn = {y''[x]/ y[x] + 1/2 (y'[x]/ y[x])^2 - 3 a/2 (y'[x]/y[x]) + k/2 (1/y[x]^2) - 3 f/2 == 0};
sol = NDSolve[{eqn /. {a -> 0.2, k -> 0.04, f -> 0.69}, y[1] == 1, y'[1] == 1}, y, {x, 0, 10}];
g[x] = 1 - a*y[x]/y'[x] - (k*y[x]^2)/(3 x^2*y'[x]^2) - f*y[x]^2/y'[x]^2;
Plot[g[x] /. sol, {x, 0, 5}, Frame -> True, AspectRatio -> 1]

```