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Input:
infsum1(x^k/k)
Write:
`infsum1(x^k/k)`
Compute:
$$\sum _{k=1}^\infty \frac {{x}^{k}}{k}$$
Output:
$$\sum _{k=1}^\infty \frac {{x}^{k}}{k}== (-log(1-x))$$
Result: $$(-log(1-x))$$
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