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Input:
sum(x,x,0,x)
Write:
`sum(x,x,0,x)`
Compute:
$$\sum _{x=0} ^ {x} x$$
Output:
$$\sum _{x=0} ^ {x} x== \frac{1}{2}\ x+\frac{1}{2}\ {x}^{2}$$
Result: $$\frac{1}{2}\ x+\frac{1}{2}\ {x}^{2}$$
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