Question: Problem to compute the multiple structure

Dear, I want to the expression for any r and s. Please help I am waiting your quick responce

Help.mw

With my best regards and sincerely.

 
Muhammad Usman
PhD (Scholar) Mathematics
HITEC University, Taxila
Lecturer of Mathematics
Govt. Degree College Taxila
Pakistan.
Visiting Lecturer of Mathematics
University of Wah, Pakistan.
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