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(1) Find all points where the functions have any relative extrema. Identify any saddle points. (a) f(x, y) = x2 +xyty2 -6x-3(b) f(2, y) =

(1) Find all points where the functions have any relative extrema. Identify any saddle points. (a) f(x, y) = x2 +xyty2 -6x-3(b) f(2, y) = x2 +y2 + xy+ 6x-6y+10(c) f(x, y) = 5xy - 722 - y2 + 3x - 6y -4 (d) f(x, y) = 4y2 + 2xy + 6x + 4y -8

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