- #1

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## Homework Statement

So this is a really simple problem and i know I'm missing something really obvious but i just can't spot it.

## Homework Equations

## The Attempt at a Solution

so in the second part above I get :

e

^{-x}- e

^{x}/2i. However I don't get the next bit as the 2i on the denominator is now factored into the top equation to give -ie

^{-x}+ ie

^{x}/2. I don't get how the 2 equations are equivalent and what they've done to get the i from the denominator to the numerator. If anyone could explain how this happened that'd be great!