Hello everybody... I have a problem, can help me with this?? A torus of radius 3 (and cross-sectional radius 1) can be represented parametrically by the function by: where D is the rectangle given by . Help please.
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You have to integrate the length of the normal vector to the surface over the region given in the plane.
First find the tangent vectors and In this problem, for example, Then find the cross product of and Now you have a vector normal to the surface of the torus. Find the magnitude of this vector. then surface area of the torus =
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