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In Exercises 35-42, find the second-order partial derivatives of the function. In each case, show that the mixed partial deriva- tives fry and fox are equal. ed novin al ji mill world unit W m 35. f (x, y) = x2y + xy' (PS DED Wo.May BEju!) 36. f (x, y) = x3 + x2 y + x + 4 47. L 11 37. f( x, y ) = x2 - 2xy + 2y' + x- 2y iwit sun 38. f (x, y ) = x3 + x2y2 + y 3 + xty 39. f (x, y) = Vx2 + y2 olvide inmind W lationship Now 40. f(x, y) = xVy + yVx lumiah A nopal Away 41. f(x, y) = e-xyl orb) smugtogmel lido butw ail alsina 42. f(x, y ) = In(1 + x2y2) Pal baliw to Jonswing on notw