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Input:
sum(x and x*x)
Write:
`sum(x and x*x)`
Compute:
$$\sum _x x\ and\ x\ x$$
Output:
$$\sum _x x\ and\ x\ x== \frac{1}{2}\ x+\frac{1}{2}\ {x}^{2}\ and\ \frac{1}{6}\ x+\frac{1}{2}\ {x}^{2}+\frac{1}{3}\ {x}^{3}$$
Result: $$\frac{1}{2}\ x+\frac{1}{2}\ {x}^{2}\ and\ \frac{1}{6}\ x+\frac{1}{2}\ {x}^{2}+\frac{1}{3}\ {x}^{3}$$
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