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sandylam966
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Homework Statement
Let F = <z,x,y>. The plane D1: z = 2x +2y-1 and the paraboloid D2: z = x^2 + y^2 intersect in a closed curve. Stoke's Theorem implies that the surface integrals of the of either surface is equal since they share a boundary (provided that the orientations match).
Homework Equations
show each of the following integral and show them that they are equal.
∫∫[itex]_{D1}[/itex](∇[itex]\wedge[/itex]F).N dS
∫∫[itex]_{D2}[/itex](∇[itex]\wedge[/itex]F).N dS
The Attempt at a Solution
I first found that the boundary is given by ]r[/U]=(cosθ +1, sinθ +1, 2(sinθ + cosθ) +3), 0<θ<2pi. Then ∫F.dr on this boundary = -3pi. Then I will try to show the 2 surface integrals equal to this.
But I have trouble parameterising the surfaces.
for D1, r = (u cosθ +1, u sinθ +1, 2r(sinθ + cosθ) +3), 0<r<1, 0<θ<2pi
for D2, r = (x, y, x^2+y^2), ,0<x^2+y^2<2x+2y-1
I tried to solve both but got really complicated integrals which I could not solve. Could someone please tell me if I have parameterise them correctly?