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Input:
expand(tosum(exp(x)))
Write:
`expand(tosum(exp(x)))`
Compute:
$$expand :\\ \ convert \ to \ sum :\\ \ exp(x)$$
Output:
$$expand :\\ \ convert \ to \ sum :\\ \ exp(x)== exp(x)-E_{1,7} (x)$$
Result: $$exp(x)-E_{1,7} (x)$$
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