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Input:
`integrate(integrate(x + y, y))`



Compute: $$\int \int (x+y)\ dy\ dx$$

$$ \int \int (x+y)\ dy\ dx == \frac{1}{2}\ x^{2}\ y+\frac{1}{2}\ x\ y^{2} $$ Result:
$$\frac{1}{2}\ x^{2}\ y+\frac{1}{2}\ x\ y^{2}$$



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