Derivation formula of vector outer product How to deduce the derivation of a (x) × B (x)

A (T) = {x1, Y1. Z1}. B (T) = {X2, Y2. Z2}. [coordinates are functions of T] a × B = | I J K | X1 Y1 Z1 | x2 Y2 Z2 | (a × b) ′ = | I J K | x1 ′ Y1 ′ Z1 ′ | + | x2 Y2 Z2 | I J K | X1 Y1 Z1 |

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