Nature of the critical points of a function f(x y): local maximum/minimum/saddle and another ● 07

[b][size=85]f(x, y) = -2 x⁵ y - 2y⁶ - 2x² y² + 2y³ + x³ + 3x² + 4y² + x y + x - y - 5[br] f[sub]x[/sub](x, y) = -4 y² x - 10y x⁴ + y + 3x² + 6x + 1 [br]f[sub]y[/sub](x, y) = -2 x⁵ - 4x² y + x - 12y⁵ + 6y² + 8y - 1 [br] f[sub]xx[/sub](x, y) = -40 x³ y + 6x - 4y² + 6 [br] f[sub]xy[/sub](x, y) = -8 y x - 10x⁴ + 1 [br]f[sub]yx[/sub](x, y) =-8 y x - 10x⁴ + 1 [br] f[sub]yy[/sub](x, y) =-4 x² - 60y⁴ + 12y + 8 [/size][/b]

Information: Nature of the critical points of a function f(x y): local maximum/minimum/saddle and another ● 07