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