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**1.find the line integral of**

(x^3-y^3)dx +(x^3+y^3)dy over r, where r is the boundary of the

region limited by x^2+y^2=1 and x^2+y^2=9

(x^3-y^3)dx +(x^3+y^3)dy over r, where r is the boundary of the

region limited by x^2+y^2=1 and x^2+y^2=9

## Homework Equations

**3.**

i found that the

line integral over the curve x^2+y^2=1 is 3*Pi/2

and the double integral of the region limited by x^2+y^2=1 and x^2+y^2=9 is 120*Pi

so the answer would be 120*Pi + 3*Pi/2 ?

i found that the

line integral over the curve x^2+y^2=1 is 3*Pi/2

and the double integral of the region limited by x^2+y^2=1 and x^2+y^2=9 is 120*Pi

so the answer would be 120*Pi + 3*Pi/2 ?