Input:
tosum(exp(x))
Write:
`tosum(exp(x))`
Output: $$ convert \ to \ sum :\\ \ exp(x) == \sum _{k=0}^\infty \frac {{x}^{k}}{(k)!} $$ Result: $$\sum _{k=0}^\infty \frac {{x}^{k}}{(k)!}$$
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