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📄 untitled-2.nb

📁 mathematic
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    \(\(f[x_] = 
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          1, \(-Pi\) \[LessEqual] x < 0, \(-1\), 0 \[LessEqual] x < Pi, 1, 
          Pi \[LessEqual] x < 2*Pi, \(-1\)];\)\), "\[IndentingNewLine]", 
    \(\(g1 = 
        Plot[f[x], {x, \(-2\)*Pi, 2*Pi}, 
          PlotStyle \[Rule] RGBColor[0, 0, 1]];\)\), "\[IndentingNewLine]", 
    \(For[i = 1, i \[LessEqual] n, \(i++\), 
      bi = 2*\((1 - \((\(-1\))\)^i)\)/\((i*Pi)\); g[x_] = g[x] + bi*Sin[i*x]; 
      g2 = Plot[g[x], {x, \(-2\)*Pi, 2*Pi}, 
          PlotStyle \[Rule] RGBColor[1, 0, 0], 
          DisplayFunction \[Rule] \ Identity]; \[IndentingNewLine]Show[g1, 
        g2, DisplayFunction \[Rule] $DisplayFunction]]\)}], "Input"],

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