by 2 dx-x (2x3+y) dy-o = V by 2 dx -2x4 dy - xydy = by "dx xydy - = 2x4 dy 6x4y²dx - x 3 ydy = 2dy bet v=x -3 dr = -3x -4dx eye (-3x-17dx-x-3ydy = 2dy - 24 - -2y2dr rydy - 2dy 2y2dr + rydy 9 -edy dr +r() dy = y dy λ = e = e adr + ra() dy = -y². dy pas dy 2. dr + retry (7) dy = -y (est) by dy dv