[일반] (u+v)-(u-v)=2v 맞지?

[익명(211.230)]

만약 x가 (u+v) 이고

y가 (u-v)일때 

x-y=를 계산하면 

2v가 나오는거 

[heisenberg(asdf5447)]

https://www.wolframalpha.com/input/?i=%28u%2Bv%29-%28u-v%29%3D2v+