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tangent is 90
Author:
shp
New Resources
王二星际太阳能旅行车
trigonometric function
堆四顆球
jap000
penrose triangle
Discover Resources
三角函數
zuiduan
平移法（三）
Comparing_fraction
平行四邊形的副本
Discover Topics
Tangent Function
Intersection
Root
Congruence
Tangent Line or Tangent
