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半角公式
Author:
Bunryu Kamimura
sin(θ/2)^2=sinθ^2/4+(1-cosθ)^2/4 これを計算してみよう。
GeoGebra
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standingwave-reflection-fixed
正17角形 作図 regular 17-gon
standingwave
対数螺旋
接点の作る円は内接円
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2次不等式の解き方
projection of x onto a1 and a2
x^2の面積(2)
放物線とその焦点
三角形の内角の和
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Rotation
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