- #1
rado5
- 73
- 0
Homework Statement
How can I prove this theorem? A, B, C and D are vectors.
(A[tex]\times[/tex]B).(C[tex]\times[/tex]D)=(A.C)(B.D)-(A.D)(B.C)
Homework Equations
A[tex]\times[/tex]B=ABsin([tex]\theta[/tex]) and A.B=ABcos([tex]\theta[/tex])
The Attempt at a Solution
Please help me solve it.