altzinthings

1.椭圆周长公式by altzin in 2024.6.22

$f\left(a,b\right)=\lim_{v \to \infty}4\sum_{n=0}^{v-1}\left(\frac{\sqrt{a^2+b^2\left(\sqrt{v^2-n^2-2n-1}-\sqrt{v^2-n^2}\right)^2}}{v}\right)$

LaTex:f\left(a,b\right)=\lim_{v \to \infty}4\sum_{n=0}^{v-1}\left(\frac{\sqrt{a^2+b^2\left(\sqrt{v^2-n^2-2n-1}-\sqrt{v^2-n^2}\right)^2}}{v}\right)