Evaluate fF.dr where f(x, y) =-y i -x j and C'is counterclockwise along the semicircle y = √4x² from (2,0) to (-2,0).
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- Find the orthogonal trajectories on the sphere x2 + y2 + z2 = a2 of its intersection with theparaboloids xy = CzFind the orthogonal trajectories of the conicoid (x + y)z = 1 of the conics in which it is cut by the system of the plane x − y + z = K where K is a parametersFind an appropriate function N(x, y) such that thedifferential equation is exact.