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Input:
sum(k)
Write:
`sum(k)`
Compute:
$$\sum _k k$$
Output:
$$\sum _k k== \frac{1}{2}\ k+\frac{1}{2}\ {k}^{2}$$ Result: $$\frac{1}{2}\ k+\frac{1}{2}\ {k}^{2}$$
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