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Input:
expand(tosum(exp(x)))
Write:
`expand(tosum(exp(x)))`
Compute:
$$expand :\\ \ \sum _{k=0}^\infty \frac {{x}^{k}}{(k)!}$$
Output:
$$expand :\\ \ \sum _{k=0}^\infty \frac {{x}^{k}}{(k)!}== exp(x)-E_{1,7} (x)$$ Result: $$exp(x)-E_{1,7} (x)$$
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