Question: subs do not work well

Hello,

subs do not work well and U functions are not replaced with series form.

Please see equation 5.

Also, How me can differential with respect to the constant A[m,n,r], B[m,n,r], C[m,n,r] as shown in  teh  attached figure?

For Differentiation I need a result .

TEMPThankssubs.mw

Diff.pdf

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