Hello, alexander9408!

Hello there, could anyone help me to solve this one?

. .

I already changed it to the partial fraction : .

For clarity, write the denominators in increasing or decreasing order.

So what's next?

Now we let

. . I will omit the leading fraction for now.

. . . . . . . . . . .

"Collect" the fractions by their denominators:

. .

. . . . . . .

Most of the terms cancel. .All that remains is:

. .

But check my work . . .please!