Vector Proof : Dot-products and Cross-Products
Show that (A x B).(C x D) = (A.C)(B.D) - (A.D)(B.C)
Show that [A x (B x C)].B = (A x B).(A x B)
https://brainmass.com/math/vector-calculus/vector-proof-dot-products-cross-products-142380
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