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| fm[f_]:=DSolve[{x''[t]+4x[t]=f,x'[t]==0,x[t]==0},x[t],t][[1,1,2]] what does the brackets [[1,1,2]] means ? |
User Portlet | Discussions |
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| fm[f_]:=DSolve[{x''[t]+4x[t]=f,x'[t]==0,x[t]==0},x[t],t][[1,1,2]] what does the brackets [[1,1,2]] means ? |