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駐波:相向而行的兩行進波線性疊加而成
Author:
ipc Wang
y=sin(3x-2t) y=sin(3x+2t)
GeoGebra
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給錐體一個名字 1
學習單：三角形任一外角與內角關係
求二次函数f(x)=-x^2+ax+3区间[-2,3]上的最大值
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