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Assume $x\gt 0$, how does one simplify $e^{(-x^2t)/i}\ ?$

I don't understand how we could change the i under to the top so I could use Euler's formula

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    Damn it, and I just figured it out myself lol. Which is funny because I spent 20 minutes whether I should ask this or not and then comes up with a solution immediately I asked2012-07-02

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Remember that $-i^2 = 1$ implies that $-i = \frac{1}{i}.$ Then apply Euler's formula as you mention.

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$\frac{1}{i}=-i$. In general, $\frac{1}{a+bi}=\frac{a-bi}{a^2+b^2}$. You can probably figure out the rest.