I'm not able to show that this expression:

can be written

Partial fraction decomposition of gives

I found by plugging into wolframalpha.

But I can't find a way to from either.

Any hints or things to try?

I have tried to write

then multiplying through by the denominator gives

and then evaluate at such that it reduces to

But that gives one equation with 2 unknowns and thus appear to be a dead end!