[積分] 問線積分

[iamOrz (I am Orz)]

Evaluate the line integral

          xdy - ydx
I = ∫---------------------
     c  (x+2y)^2 + (3x-y)^2

where C is the closed curve defined by (x+2y)^2 + (3x-y)^2 = 1 in

counterclockwise direction.

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