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