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plane geometry

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旋轮线一个圆在直线上作纯滚动（接触点无滑动），圆上某一点形成的轨迹叫做旋轮线，其参数方程写为 $$ \left\{\begin{array}{cc} x&=&a(\theta-\sin\the...

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tools JXG Preview magma PARI/GP https://www.mathcha.io https://jsxgraph.uni-bayreuth.de/...

test math formula: $$\int_0^\infty\frac{1}{1+x^2}dx=\pi/2$$ $\alpha\lt\beta$，$\gamma\pi$ JXG.Op...

Menelaus定理三角形ABC，D, E, F分别在直线BC, AC, AB上，则D, E, F共线的充分必要条件是：有符号线段比值（反方向取负比值）满足 $$\frac{BD}{DC}\f...

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