三角関数の和と積を見る.nb

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Sin[x] + 1/3 Sin[3 x] + 1/5 Sin[5 x] + 1/7 Sin[7 x] + 1/9 Sin[9 x] + 1/11 Sin[11 x] + 1/13 Sin[13 x] + 1/15 Sin[15 x] + 1/17 Sin[17 x] + 1/19 Sin[19 x] + 1/21 Sin[21 x]

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n を大きくすると次のグラフに近ずくことが確認できます

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Converted by Mathematica (May 23, 2003)