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Tangent and Radius(切線及半徑)
Author:
chisunch1
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圓錐曲線
过圆上一点作切线，三步
柯西不等式
y=ax^2+bx+c
拼出三角形的副本
New Resources
內心
垂心
勒洛三角形任意點P軌跡
vector sum
旁心
