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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}
