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和差公式 sin(α-β) de证明
Author:
WeiLinWilla
GeoGebra
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第八周作业
第八周作业1
异形操场
第八周作业2
折扣
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圓例8
碎形
linear programing by Mr LO WY
旋轉圓弧
拋物線1--焦點法
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Function Graph
Histogram
Similar Triangles
Power Functions
Pythagoras or Pythagorean Theorem