荒咬

VS^{1} 均匀分布,U 是其上的固定点, U \cdot V \sim ?
定义累积分布 F(X)=Pr(U \cdot V < x)
考虑 x \in [0,1] 的情形,其他类似
满足条件的点集构成 S^{1} 上的弧,取它们的测度为 S^{1} 的弧长
F(x)=\frac{2arcsin(x)}{2\frac{\pi}{2}}
f(x)=\frac{dF(x)}{dx}=\frac{2}{\pi \sqrt{1-x^2}}

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