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## Homework Statement

I at a point in a derivation where I have the expression:

[tex]A = \frac{e^{mx} - e^{2ml - mx}}{1-e^{2ml}}[/tex]

I have double checked my work leading up to this point, so i am confident my expression for 'A' is correct. I am supposed to reduce it to

[tex]A = e^{mx}[/tex]

but I am not seeing the trick here. I have tried numerous approaches from factoring the denominator and various arrangements of the numerator. I have a feeling it is one of those random tricks i need. Any thoughts?

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