2 mn, 0. ax + hy + dx hx+by +f 0 0. dy ax hy +9 dx example. solve sol. the given equation is (hx + by + f)dy+ (ax + hy +g)dx = 0 ax dx + by dy + h(x dy + y dx)

2 mn, 0. aX + hy + dx hx+by +f 0 0. dy ax hy +9 dx Example. Solve Sol. The given equation is (hx + by + f)dy+ (ax + hy +g)dx = 0 ax dx + by dy + h(x dy + y dx) + g dx + f dy = 0 or, +bd|+ hd (xy) +g dx + f dy = 0 2 y2 2 x2 a d or, d (ax +by ) +h (xy) +gx + fy= 0. or, I need explanation 3rd step for d(x^2/2) and d(y^2/2)