Derivation of d/dt.

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Quantum Mechanics, Griffiths. Section 1.5 Momentum.  Derivation of d<x>/dt.  I did the derivation for practice and just don't see where the negative sign comes from.  I've attached an image of my work.

momentam fi fune suolutan olocfataon volno ofx
く>-×+ax -(xがfa
メ
dt
-(発。
dluns) = udv
vdu
%3D
* -水文
*す。
3D
ー UV
鉄)
全。
it
S(会 -ウす
よ(芸
Set w=x do. が-
du =dx
xe
ポー
さ×
V =
歳 -
let
以こ
bçause
Transcribed Image Text:momentam fi fune suolutan olocfataon volno ofx く>-×+ax -(xがfa メ dt -(発。 dluns) = udv vdu %3D * -水文 *す。 3D ー UV 鉄) 全。 it S(会 -ウす よ(芸 Set w=x do. が- du =dx xe ポー さ× V = 歳 - let 以こ bçause
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