Find a function f such that F = Vf and (b) use part (a) to evaluate F. dr along the given curve C.. F(x, y) = (3+2xy)i+ 2xyj C is the arc of the hyperbola y = 1/x from (1, 1) to (4, 1) 13. F(x,y) = xyi+xyj, Cr(t) = (-2t, t+2t), 0