Partial fraction decomposition

[Adhamhashem2022]

I need help to solve The partial fraction to solve this problem. I do not know how he solved the partial fraction only but I know rest of the solution.

 

[lex]

Are you asking how they performed the partial fraction decomposition?
They have just equated:
[imath]\tfrac{A}{x+i}+\tfrac{B}{x-i}=\tfrac{1}{(x+i)(x-i)}[/imath]
and solved for A and B, as normal.

 

[topsquark]

Please do not double post. See this thread.

-Dan