Please help me for getting the displacement due to changing load , the equation is attached herewith

Please help me for getting the displacement due to changing load , the equation is attached herewith

[Walter Roberson]

It is not obvious to me that the outer summation is necessarily convergent such that you could numerically truncate the infinite summation ?

[Chris Martin]

Actually it is a general equation , I need rather for degree and order up to 50

[Walter Roberson]

You have an infinite summation in the equation. Is there reason to expect that the summation will converge?

[Chris Martin]

No