1. The problem statement, all variables and given/known data Find an expression equivalent for the derivative of the scalar triple product a(t) . (b(t) x c(t)) 3. The attempt at a solution Initially I figured since whatever comes out of B X C is being dotted with A, I can use the derivative rules of a dot product: (a(t)' . (b(t) x c(t))) + ( a(t) . (b(t) x c(t))' ) However, the solution just gives an expression for the scalar triple product in a 3x3 matrix form, that is, a(t) . (b(t) x c(t)) = [ a1 a2 a3 b1 b2 b3 c1 c2 c3 ] What gives?