Let - (y dx – x dy) W = (x² + y²)ª be a one-form on U =R² \ {(0,0)}, and o : V → U be the smooth function $(r,t) = (r cost, r sint) with V = {(r, t) E R² | r + 0}. Find d(o*w). d(ow) =| dr A dt 2.

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