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点の存在範囲（0≤c≤1）
Author:
嶋津恒彦
GeoGebra
New Resources
直線の軌跡
standingwave
sine-wave
standingwave-plus
standingwave-reflection-fixed
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光の反射と屈折 Fresnel equations
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Design ruler 7
接弦定理
振動数と振幅の大きさ