Question
Fri February 20, 2009 By:

to prove:-

Expert Reply
Sun February 22, 2009
Beginning with the ubiquitous triple product identity

Ax(BxC) = B(A.C)-C(A.B) (1)

for vectors in R^3, we immediately have the handy formula for the
cross product of two cross products

(AxB)x(CxD) = B[(CxD).A] - A[(CxD).B]
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