关于椭圆积分
第二类椭圆积分加法公式是怎么推导的？ 这个需要用到椭圆函数的性质，要看懂不容易 \[ E(u+v,\color{gray}{k})=E(u,\color{gray}{k})+E(v,\color{gray}{k})-{\color{gray}{k}}^2\operatorname{sn}(u,\color{gray}{k})\operatorname{sn}(v,\color{gray}{k})\operatorname{sn}(u+v,\color{gray}{k}) \]\[ \Pi(\color{gray}{n},u+v,\color{gray}{k})=\Pi(\color{gray}{n},u,\color{gray}{k})+\Pi(\color{gray}{n},v,\color{gray}{k})-\frac{1}{2}\ln\frac{1+{\color{gray}{k}}^2\operatorname{sn}(\color{gray}{n},\color{gray}{k})\operatorname{sn}(u,\color{gray}{k})\operatorname{sn}(u+v+a,\color{gray}{k})}{1-{\color{gray}{k}}^2\operatorname{sn}(\color{gray}{n},\color{gray}{k})\operatorname{sn}(u,\color{gray}{k})\operatorname{sn}(u+v-a,\color{gray}{k})} \] 可以构造差函数来求导证明第二类椭圆积分加法公式
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