$$ \alpha\alpha $$
{ { {#!latex $$ \sum_{i=0}^{\infty} \frac{x^i}{i!} $$} } }
$$ \sum_{i=0}^{\infty} \frac{x^i}{i!} $$
[[latex((1 + x)^n = 1 + \frac{nx}{1!} + \frac{n(n-1)x^2}{2!} + ...)]]