Why use the hypothesis of n=m-1 with a step-by-step explanation of the solution and a clear line, please Since (m-1)! = * Ohen m=0 A50, the tem yresponding to m=o vanisnes Therepre Changing tue variable of Summation to n=m -1 (リn+」 Σ m!r(n+v+2) an+V+1 2n+1 0ニ4 2n+ V+1 - V (-1)" x n=o n! rn+l +v+1) 2 2n+V+1 - リnx2h+V+1 iu 3 2n+V+1 r (n+l+v+1) ーズV レ+」(x) ッ+ Hence a [zVI, x)] =-xJvi (x) Hence [zJ, (x)] = -* ニーメJvti x) (Proved) %3D

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