some text that is not formated
a 2 {\displaystyle a^{2}} 5 {\displaystyle {\sqrt {5}}} ∑ n = 0 ∞ a n n ! {\displaystyle \sum _{n=0}^{\infty }{\frac {a^{n}}{n!}}} lim x → ∞ f ( x ) = 0 {\displaystyle \lim _{x\to \infty }f(x)=0}
