URGENT
Can someone answer these two questions within the next hour?
Use Green’s Theorem to find the integral of the vector field F~ (x, y) = (5y + 4x)~i + (3y − 7x)~j counterclockwise around the ellipse x 2 9 + y 2 = 1. Hint: The area of the ellipse with equation x 2/ a 2 + y 2 /b 2 = 1 is πab.
Use Stokes’ Theorem to compute Z C F~ · d~s where F~ (x, y, z) = y 2~i + z 2~j + x~k and the curve C is the triangle in 3-space with vertices at (1, 0, 0), (0, 1, 0), and (0, 0, 1). Hints: (a) For the surface S needed in Stokes’ Theorem, use the part of the plane x + y + z = 1 that lies in the first octant. (b) That plane can be written parametrically as Φ(x, y) = hx, y, 1 − x − yi. (c) Make sure you have the upward pointing normal!
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