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projection of x onto a1,a2,a3 in 3D

Author:tttamaki

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sine-wave
standingwave-reflection-free
正１７角形　作図　regular 17-gon
standingwave-reflection-fixed
二次曲線と離心率

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外分点の座標を求める。
正五角形の作図
光源とベクトル
エレベータの動き（比例のグラフ）
円に内接する四角形

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