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useful links
tools JXG Preview magma PARI/GP https://www.mathcha.io https://jsxgraph.uni-bayreuth.de/...
test
test math formula: $$\int_0^\infty\frac{1}{1+x^2}dx=\pi/2$$ $\alpha\lt\beta$,$\gamma\pi$ JXG.Op...
旋轮线
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...
games
2048 fifteen flatris life sudoku sweeper