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Question: why my pde not give me zero?

Question:why my pde not give me zero?

salim-barzani 1700 Maple 2024
substitution pde differential-equations pdetest
4 hours ago
0

in here i did samething as author did and i substitute same function as he did also except this i did this for anotehr paper too but i have same problem i used this function as a solution but i don't know where  is problem and why i don't get my pdes to zero i am stuck and this is for me is keypoint becuase there is 5 function like and this is the easiest one if i do this i can hundle the others please help me to provide a true solution , eq(19) must be our solution 

 

zero-pde.mw

 

function-pde.mw

A-pde.mw
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