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x^2+y^2 = 2x, (x-1)^2+y^2 = 1
x = 1+cost, y = sint, x'<t> = -sint, y'<t> = cost
ds = √[(-cost)^2+(sint)^2]dt = dt
I = ∮<L>(x^2+y^2)ds = ∫<0, 2π>[(1+cost)^2+(sint)^2]dt
= ∫<0, 2π>(2+2cost)dt = [2t+2sint]<0, 2π> = 4π
x = 1+cost, y = sint, x'<t> = -sint, y'<t> = cost
ds = √[(-cost)^2+(sint)^2]dt = dt
I = ∮<L>(x^2+y^2)ds = ∫<0, 2π>[(1+cost)^2+(sint)^2]dt
= ∫<0, 2π>(2+2cost)dt = [2t+2sint]<0, 2π> = 4π
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