Hi, I need help with this problem Evaluate the given integral by changing to polar cordinates ∫∫xydA where D is the disc with centre the origin and radius. My solution so far. I believe this would give a circle with radius 3 in xy plane. And then x=r*cos(θ) and y=r*sin(θ) So ∫(∫((r*cos(θ)*r*sin(θ))*r,r,0,3),θ,0,2∏) But the result is suppose to be zero. What am I doing wrong?