Question: Double & multiple integrals

1) SS (x^2 + y^2) dxdy D: y=x, y=x+a, y=a, y=3*a, a>0 2) SS ln(1+x^2+y^2) dxdy D: (x^2+y^2)=R^2 x>=0, y>=0 3) SSS x*y*z dxdydz D: x=-1 x=2 y=0 y=2 z=-2 z=2 4) S (x-y) dS L: x^2+y^2=3*x
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