[MATH]\int_{0}^{1} \int_{1}^{9} \frac{y}{x + y^2} \ dx \ dy + \int_{1}^{3} \int_{y^2}^{9} \frac{y}{x + y^2} \ dx \ dy[/MATH]
The second option. The easy way. You can switch the variables.
[MATH]\int_{1}^{9} \int_{0}^{\sqrt{x}} \frac{y}{x + y^2} \ dy \ dx[/MATH]
Can you show us your thoughts? Why did we set the limits of integration like that? How will you solve this integral? How do you think the second integral which has triangle vertices will be solve?
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