Homework Statement
Proove that...
(AxB)x(CxD)=(A.BxD)C-(A.BxC)D=(A.CxD)B-(B.CxD)A
using Permutation Symbols
Homework EquationsThe Attempt at a Solution
I am confused about what to do after the third line from 'vela's response' (Post #2 from the reference link below).
Reference...