(Two further formulas for the derivative). Formulas (4).
Chapter 13, Problem 13.4(choose chapter or problem)
(Two further formulas for the derivative). Formulas (4). (5), and (J I) (below) are needed from time to time. Derive (II) J'(;:;) = Ux - illy, f' (z) = Vy + ivx '
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